Bohemia

The Czech-speaking kingdom of the Přemyslid and Luxembourg dynasties, an Elector of the Holy Roman Empire that briefly held the Imperial throne itself, and the country whose Hussite revolt produced Latin Christendom's first state to break openly with Rome and survive it - grown from a Moravian empire whose own princes' quarrel let the Magyars conquer it outright, and absorbed in turn into the Habsburg Monarchy its own kings had helped build.

The line below is a time axis. Position on it is date, so concurrency is visible: concurrent polities sit side by side rather than in sequence.

2 sourced edges run between this region and another, to The Kingdom of Hungary. Those are not drawn on this line — a thread that crossed regions would assert a sequence nobody cited — but they are on each polity’s own page.