An elected Ibadi imamate that became a hereditary sultanate, moved its capital to an island off Africa, and built the Indian Ocean's last Arab empire on cloves, ivory and slaves.
Army raised byHow the fighting force was recruited, not how it fought.
tribal levy andmercenary
tribal levy — Contingents raised through kin or tribal structures the ruler did not create
mercenary — Hired for pay, with no standing obligation either way
Risso, Oman and Muscat: An Early Modern History (1986)
Revenue fromWhat the state lived on. The values are unranked: the field cannot express which mattered most.
trade toll andland tax
trade toll — Customs, straits dues and caravan levies
land tax — Tax on agricultural production and land
Sheriff, Eastern African Studies (1987)
Succession byThe rule in force, not the outcome. A rule repeatedly violated is still the rule.
No cited figure
Right to rule fromThe ground publicly asserted — on coins, in the khutba, in titles.
election anddescent
election — Chosen by a body entitled to choose
descent — Descent from a house or lineage, publicly invoked
Risso, Oman and Muscat: An Early Modern History (1986)
Each line is drawn from a source that addresses the question directly. A line reads No cited figure where no source consulted does — never because the answer seemed obvious.
Turning points
3 hinges
1798The first English agreementtreaty
Muscat signed an agreement with the East India Company excluding the French and Dutch from its ports, at a moment when Bonaparte was in Egypt and the Company was anxious about the route to India. It is the beginning of a relationship that supplied the sultanate with a guarantor for a century and then used the leverage to dismantle its economy.
Risso, Oman and Muscat: An Early Modern History (1986)
1840The court moves to Zanzibarcapital move
Sa'id bin Sultan settled his court permanently on an island off the East African coast, two thousand miles from Oman. The centre of gravity of an Arabian polity moved to Africa, its revenue became African, and the Omani half of the empire was thereafter the poorer and more neglected one — which is why the partition twenty-one years later divided it the way it did.
Sheriff, Eastern African Studies (1987)
1845The Hamerton Treatytreaty
Under British pressure the sultan agreed to confine the slave trade to his own African dominions, prohibiting export to Arabia and the Gulf. It began the legal dismantling of the traffic the empire's commercial system rested on, by the power whose protection the empire also rested on, and the two facts were understood in Zanzibar to be the same fact.
Sheriff, Eastern African Studies (1987)
Chapters
8 in order
The man who got the Persians out
Drafted from Risso, Oman and Muscat: An Early Modern History (1986)formation
Ahmad bin Sa'id was the Ya'ariba governor of Sohar when the imamate collapsed
into the Hinawi–Ghafiri war and one of the factions invited a Persian army in.
Nadir Shah's troops landed on the Batinah coast in the late 1730s and took the
ports; Ahmad held Sohar through a siege that lasted months, and then removed
them from Oman by a combination of negotiation, payment and — in the account
most often repeated, and hardest to verify — a massacre of the garrison
commanders at a banquet.
In 1744 the scholars elected him imam. The procedure was the one the record has
now recorded three times in Oman: the community's learned men choosing the
best-qualified candidate, who could be deposed if he failed.
He was a competent ruler for nearly forty years. He put down the tribal factions
without ending them, rebuilt the fleet, held Muscat and Sohar and the interior,
and re-established the East African stations that had been let go during the
civil war. He also fought off a Persian attempt on the Gulf and, when the Ottoman
governor of Basra was besieged by the Persians in 1775, sent ships to relieve
him — for which the Ottomans paid, and which is a fair summary of how the
sultanate made money.
The dynasty he founded still reigns in Oman, which makes it one of the longest
continuously ruling houses anywhere — and it does so under a title Ahmad never
held, because the office he was elected to did not survive his grandsons.
An elective office becoming a family's
Drafted from Risso, Oman and Muscat: An Early Modern History (1986)aside
Ahmad bin Sa'id was elected imam. His son Sa'id bin Ahmad was elected imam after
him. His grandson was not: by the 1790s the rulers of Oman had stopped seeking
election, dropped the title of imam, and called themselves sayyid and then
sultan — a word with no Ibadi content at all — and the office passed from father
to son.
That is the same thing that happened to the Zaydi imamate of Yemen after 1636,
on a page two entries away in this region, and the parallel is close enough to
be worth stating as a finding rather than a coincidence.
Both offices were doctrinally elective and explicitly not hereditary. Both were
held by one family for long enough that the family became the obvious candidate.
Both families then found the doctrine inconvenient, because an office open to
any qualified claimant gives every qualified claimant a standing right to rise
against the incumbent. The Zaydi answer, on the Yemeni page, was to revise the
jurisprudence. The Omani answer was simpler: stop calling it an imamate.
The consequence was the same in both places, and in Oman it is still visible on
a map. The interior did not accept it. The Ibadi scholars of the interior went on
holding that the imamate existed and that Muscat's sultans were not imams, and
they reconstituted the office when they could — in 1868 briefly, in 1913
seriously, with a treaty in 1920 recognising an imam at Nizwa alongside a sultan
at Muscat, and a war in the 1950s that ended it.
So there is no rule of succession to state for this dynasty, and the absence is
the fact rather than a gap. The two Omani polities before it were elective and
said so. This one spent its first fifty years being elective and the rest of its
life quietly not being, without ever replacing the doctrine with another one.
There is a second thing worth admitting. The span ends in 1861. The dynasty did not end in 1861 and has
not ended; the Al Bu Sa'id are the ruling house of Oman today. What the span
measures is the empire — from the election of 1744 to the partition that
separated Zanzibar from Muscat — because the empire is the thing with a
beginning and an end. There is no honest way to record a polity that is still
running, and every entry in it stops.
The coast recovered
Drafted from Razik, History of the Imâms and Seyyids of 'Omân, from A.D. 661-1856 (1871)expansion
The East African coast was not conquered by the Al Bu Sa'id. It was inherited,
lost, and taken back over about seventy years, and the sequence is worth
following because it explains why the empire ended up centred on an island
rather than on Muscat.
Mombasa had thrown off its allegiance to Oman during the reign of the founder,
Ahmad bin Sa'id. That is the position at the start: a dynasty holding the
Ya'ariba's overseas possessions on paper and losing the most important of them
almost immediately.
In 1784 an expedition sent by Ahmad's brother, then imam, brought the island of
Zanzibar to submission. The regent who followed was bent on recovering Mombasa
and did not manage it. It was not finally annexed until the long reign of Sa'id
bin Sultan, who took it along with the other ports and islands of that coast —
and those are precisely the territories that afterwards became the independent
principality of Zanzibar.
The northern half
While that was going on the same state was operating at the other end of the
Gulf, and the chronicle is clearer about this than about Africa.
Sa'id held Gombroon — Bandar Abbas — on the Persian shore and exercised
sovereign rights there, which is plain from the terms of the treaty the East
India Company made with him. An Arabian sultanate collecting the customs of a
Persian port, under an arrangement a European trading company thought worth
formalising.
That is the shape of the state at its widest: the Omani coast, a Persian port,
the Gulf, and an African littoral from Mombasa southward. Almost none of it was
territory in the sense of ground held by garrisons. It was harbours, customs
houses and the sea between them.
What was given away
One transaction from the end of the expansion says more about the position than
any of the conquests, and the chronicle's editor prints the document in full.
In July 1854 Sa'id bin Sultan signed over the Kuria Muria islands, off the coast
of Mahra, to the British crown. The deed is short and unmistakably a personal
act:
Captain Fremantle having come to me from the great Queen, asking from me the
Islands of Khalfan ... I hereby give to her imperial Majesty the Sovereign of
England, her Majesty Queen Victoria, the said islands, and to her children
after her. I give them absolutely, on my own behalf, and on behalf of my
children after me, of my own free will, and without any drawback on my part.
The editor adds the detail that makes it interesting. The islands were at that
time tributary to shaikhs at Mirbat, and Mahra had not recognised Omani
suzerainty for centuries. Sa'id was giving away, by a stretch of authority he was
glad to have British countenance for, something he did not securely hold.
That is the whole logic of the last phase of the expansion. The empire was
built on being useful to the British in the western Indian Ocean, and being
useful was worth more than the islands were. Seven years after that deed, when
his sons quarrelled over the inheritance, it was a British viceroy who divided
it between them.
An Arabian sultan in Africa
Drafted from Sheriff, Eastern African Studies (1987)peak
Sa'id bin Sultan ruled for fifty years from 1806 and moved his capital to
Zanzibar. The move was gradual — he was on the island for long stretches from
the 1820s and permanently from about 1840 — and it is the decisive act of this
reign: the centre of an Arabian polity relocated to an African island two thousand
miles from the country it was named after.
What made the island worth it was an economic transformation Sheriff's book is
the standard account of, and it had two parts.
The first was cloves. The plant was introduced to Zanzibar and Pemba from the
Indian Ocean spice islands in the 1810s and 1820s, and the sultan and the Omani
landowning families who followed him planted it on a scale that made the
archipelago the world's principal producer within a generation. The labour was
enslaved East Africans, and the significant change is in the direction of the
trade: slaves who had previously been exported became instead the workforce
producing an export. The plantations were owned by the sultan and his relatives
among others.
The second was ivory. European and American demand — for piano keys, billiard
balls, combs, cutlery handles — pushed a trading frontier inland from the coast,
along caravan routes financed from Zanzibar, first to Lake Tanganyika and
eventually to the eastern Congo. The caravans carried cloth and guns in and
ivory and captives out, and the political disruption they caused in the interior
is a substantial part of the history of nineteenth-century East Africa.
The money was moved by Indian merchant houses. The customs of Zanzibar were
farmed to a Kutchi Bhatia or Ismaili firm which paid the sultan a fixed annual
sum and advanced him credit against it, and the same houses financed the caravans
and bought the crop. The customs came before the land, in other words, and the
sultanate's treasury was in practice an arrangement with
a merchant community that was neither Omani nor African.
And the buyers were Western. Sa'id signed commercial treaties with the United
States in 1833, Britain in 1839 and France in 1844; American cloth from Salem
was so dominant in the East African market that the Swahili word for unbleached
cotton is merikani. An Arab sultanate on an African island was, by the middle
of the century, a fully integrated node of a world economy centred somewhere
else — which is Sheriff's argument and his title.
As well appointed as Her Majesty's
Drafted from Wellsted, Travels in Arabia, Volume I (1838)peak
In the 1830s a lieutenant of the Indian Navy surveyed the Omani coast, travelled
inland, and wrote an assessment of Sayyid Said's power for readers in London. It
is the most useful description of the Busaid state at its height precisely
because Wellsted was not admiring it. He was working out what it could do to the
British if it chose to.
The inventory first. Said's navy consisted of four heavy frigates, two of them
of fifty guns; three corvettes of eighteen to twenty-two; and several smaller
warships. To those could be added his own merchant ships, the Arab-flagged
vessels constantly trading into Muscat, and — beyond everything else, on account
of their numbers — the country baghlas, some of over two hundred tons. Wellsted
reckoned the sultan could assemble transport for twenty thousand men.
Then the judgement that costs him something to make. The ships of the Imam of
Muscat, he writes, are as well constructed and as well appointed as Her Majesty's.
Then the harbour. Muscat commands the entrance to the Persian Gulf; its
anchorages would shelter any number of ships; in the hands of a skilful engineer
it could be made almost impregnable in a short time. Against which the British
usually had one or two vessels of twelve or eighteen guns in the whole Gulf, and
a squadron from India needed a month to arrive in certain seasons.
Wellsted's anxiety is Russian and reads oddly now — he spends pages on the
possibility that Said's squadron might make a rendezvous with a Russian force at
Basra, which, manned with Russian seamen, would hold naval superiority in the
Indian seas for some period. The scenario never had much in it. What the scenario
proves is the point: a British naval officer in 1838 could construct a plausible
nightmare in which the decisive fleet in the western Indian Ocean was Omani,
because in 1838 the Omani fleet was the largest thing in that ocean not flying a
European flag.
And then, at the end of the chapter, the other half of the relationship. A
reciprocal treaty of alliance, offensive and defensive, had been concluded with
Said, stipulating in what Wellsted calls Eastern phraseology that his enemies
should be Britain's enemies and his friends Britain's friends; and up to that
feeling, he says, the British had acted until very lately. But when the
probability of the sultan actually asking for assistance came before the Supreme
Government of India, the passage of the treaty began to be construed.
That sentence dates the peak more exactly than any tonnage figure. Said's fleet
was at its largest, his commercial empire ran from the Gulf to Zanzibar, and the
ally who had promised that his enemies were theirs had started reading the
promise closely before being asked to keep it.
What it ran on
Drafted from Sheriff, Eastern African Studies (1987)contraction
The Zanzibar empire was built on slavery, and it is worth saying so plainly
rather than in the passive constructions the older literature used.
The clove and grain plantations of Zanzibar and Pemba were worked by enslaved
people brought from the mainland, in numbers Sheriff estimates in the hundreds
of thousands across the period, with a mortality on the crossing and in the first
year of labour that the sources record without much comment. The caravans that
went inland for ivory bought and captured people to carry it, and sold them at
the coast when they arrived. The market at Zanzibar was the largest in the
western Indian Ocean. The sultan taxed every transaction and his family owned
plantations.
None of this was unusual for the period and none of it is mitigated by that. A
customs duty and a land tax sound like ordinary fiscal categories, the same
kind levied everywhere from Egypt to China, and on their own they say nothing
about what was actually being taxed: a duty on the sale of human beings, and
the produce of estates worked by people who had themselves been sold. A
comparative vocabulary built to hold sixty different states side by side
cannot carry that distinction on its own, which is exactly why the plantations
and the caravans have to be named here rather than left to a neutral label to
convey.
The dismantling came from the power that was also the guarantor, which is the
other half of the century. Britain wanted the trade ended and wanted a friendly
Zanzibar; it obtained the Moresby Treaty in 1822 restricting sales to Christian
powers, the Hamerton Treaty in 1845 confining the traffic to the sultan's own
African dominions, and in 1873 — after the empire had already been partitioned — a treaty closing the Zanzibar market entirely, obtained under the
threat of a naval blockade.
Each of those agreements removed a part of the sultanate's revenue, and each was
signed because the alternative was worse. It is the same relationship Qajar
Iran had with Britain and Russia, and the Ottomans had with the same European
powers in the Mediterranean: a state whose independence was underwritten by a
European power that was simultaneously legislating its economy out of
existence, and which signed each instrument because refusing was not
available.
Zanzibar became a British protectorate in 1890, twenty-nine years after the
partition and four decades after the first serious pressure.
The arbitration, and the office coming back
Drafted from Sheriff, Eastern African Studies (1987)end
Sa'id bin Sultan died at sea in 1856 on the passage between his two capitals,
which is a tidy fact and a true one. He left the African dominions to one son,
Majid, and Oman to another, Thuwaini, and the brothers disputed it.
The dispute was referred to the Governor-General of India, and in 1861 Lord
Canning's award divided the empire: Zanzibar and the East African coast to
Majid, Muscat and Oman to Thuwaini, and an annual subsidy of forty thousand
crowns payable from the richer half to the poorer to compensate for the
inequality. Both accepted.
What happened is unusual enough to note: the empire was not conquered, did not
collapse and was not overthrown. It was divided by an arbitration both parties
had asked for, conducted by a third power neither of them ruled, and the losing
side was paid.
What followed on each side belongs in one paragraph each. Zanzibar's revenue survived the partition and then did not
survive the closing of the slave market in 1873 and the European partition of
East Africa that followed; it became a British protectorate in 1890, and the
Anglo-Zanzibar War of 1896 lasted around forty minutes. Oman became poorer,
more isolated, and increasingly dependent on British subsidy and advice.
And in the Omani interior the office came back. The Ibadi scholars had never
accepted that the sultans of Muscat were imams, and in 1913 they elected one and
took the interior. The Treaty of Seeb in 1920 recognised the position without
naming it: an imam governing the interior in autonomy, a sultan governing Muscat
and the coast, and neither interfering with the other. That lasted until oil
concessions made the interior worth controlling, and the Jebel Akhdar war of
1954 to 1959 — fought by the sultan with British aircraft and Special Air
Service troops — ended the imamate for the last time.
The Omani office kept being reconstituted in the same mountains for a
millennium, and the full sequence is this: 750, 793, 1624, 1744, 1868, 1913.
The last of them was put down by aircraft.
The manuscript
Drafted from Razik, History of the Imâms and Seyyids of 'Omân, from A.D. 661-1856 (1871)afterlife
Sayyid Sa'id died in 1856 and his sons went to the edge of war over what he had
left. Thuwayni had succeeded to Oman; Majid claimed Zanzibar, the neighbouring
islands and the Arab settlements on the mainland opposite.
Fighting was prevented by the friendly intervention of the Government of Bombay,
and the brothers agreed to submit the dispute to the arbitration of the Viceroy
of India and to abide by his decision. A commission of two was appointed to
report on the matters at issue — a British brigadier and a British chaplain —
and its work involved personal interviews with both sayyids, at Muscat and at
Zanzibar.
That is how an Arab maritime empire was divided: by two Englishmen travelling
between the two halves of it, writing a report for a third Englishman in
Calcutta.
What the sultan gave the commissioner
While the commission was at Muscat in 1860, Sayyid Thuwayni made the chaplain a
present.
It was the original manuscript of the history of the imams and sayyids of Oman —
the chronicle of his own dynasty and of the four imamates before it, running from
the seventh century to his father's death, and, as the chaplain came to
understand, unique in the continuity and fullness of its narrative. Nothing
comparable existed for Oman from any other source; the native records the earlier
parts were compiled from had never been used by any foreign writer, east or
west.
The recipient translated it, annotated it heavily in the manner of a Victorian
churchman who thought the Ibadis fanatical, and published it in London in 1871.
There is no reason to read the gift as naive. Thuwayni was in the middle of an
arbitration whose outcome would determine whether he got the profitable half of
his father's empire or the other one, and he handed the arbitrator's colleague
the document that established what Oman had been for twelve hundred years before
the British arrived. It did not work. The richer half went to his brother, with
Zanzibar bound to pay Muscat forty thousand crowns a year — a sum the two sides
had already been arguing about, and which the award left deliberately ambiguous
as between a tribute implying subjection and a subsidy implying none. It was not
a foolish thing to try.
What it means that the book is why we know
The consequence is worth saying plainly.
Almost everything anybody can say about the Ibadi imamate of the ninth century,
the Ya'ariba who took Mombasa, and the family that moved its capital to an
island — the elections, the depositions, the camels walked round the pillar at
Nizwa, the books burnt in 893, the horse in the valley behind Muscat — comes
through one manuscript, handed to a foreign commissioner by a sultan hoping to
improve his position in a partition of his own inheritance.
The two halves
The division held. Zanzibar and Muscat became separate states with separate
sultans of the same family, and their subsequent histories have almost nothing
in common: one became a British protectorate on the clove and slave economy of
the East African coast, the other went back to being an Arabian port with a
mountainous interior behind it that it did not control.
And in that interior the old procedure was still available. The Al Bu Sa'id had
begun in 1744 with an assembly electing Ahmad bin Sa'id imam, and had spent a
century converting that office into a hereditary sultanate governed from
overseas. What was left behind when the overseas half was detached was the
country where an imam could still be elected — the same towns, the same
assembly, the same qualifications — and a sultan on the coast whose title rested
on having stopped being one.
Ahmad bin Sa'id, the Ya'ariba governor of Sohar, held his town through a siege, negotiated and fought the Persian occupation out of Oman, and was elected imam by the scholars in place of the house that had invited it in.
What led away
1861the Sultanate of Zanzibar
Sa'id bin Sultan died in 1856 and his sons went to the edge of war over the inheritance: Thuwayni had Oman, Majid claimed Zanzibar, the neighbouring islands and the mainland settlements. Bombay prevented the fighting, the brothers submitted to the arbitration of the Viceroy of India, and the award gave Majid the African half — bound to pay Muscat forty thousand crowns a year, in terms left ambiguous as between a tribute implying subjection and a subsidy implying none.
1861the Sultanate of Muscat and Oman
The Arabian half, and the poorer one: an Arabian port with a mountainous interior behind it that the sultan did not control, drawing an annual payment from the richer half of what had been one state. The dynasty continued here and continues.
Derived from cited spans, not from a separate source. Where both spans are ranges and they meet only on the widest reading of each, the pair is listed as possible rather than resolved to one answer. Unlinked entries are here for scale and are not written up.
Extent
The historical-basemaps snapshots are world maps at fixed years, and none of the ones falling inside this polity's lifetime names it among the polities it draws.
Rating
Four axes, all computed from cited numbers and never from editorial judgement. Percentiles are against every polity written up here — 280 of them — plus 50 more included for scale. Absolute figures. A missing axis is excluded from the total rather than counted as zero.
Reach
No cited figure
Longevity
107–117 years
27th to 29th percentile — the sources disagree on the span, so the rank is a range too
Demographic weight
No cited figure
Influence
Three separate counts. This site never publishes a single influence number of its own; the sliders on the rankings view fuse them only in your view.
Descendant scripts
No cited figure
Religions carried
No cited figure
Successor claims
No cited figure
Weighted total
28th percentile
computed from 1 of 4 axes, renormalised across the axes that have figures. A polity with two documented axes is not penalised against one with four.