Japan

The one imperial house never replaced, only sidelined: a single continuous throne standing behind six changes of who actually governed in its name, from the shoguns of Kamakura to the shoguns of Edo.

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.

600700800900100011001200130014001500160017001800Yamato (Imperial Japan) 540 – 1192The Kamakura Shogunate 1192 – 1333The Kenmu Restoration 1333 – 1336The Ashikaga Shogunate 1336 – 1573Nanboku-chō (the Southern Court) 1336 – 1392The Toyotomi Regime 1582 – 1600The Tokugawa Shogunate 1603 – 18681192 The Kamakura Shogunate claimed legitimacy of Yamato (Imperial Japan)1333 The Kenmu Restoration overthrew The Kamakura Shogunate1336 Nanboku-chō (the Southern Court) partitioned from The Kenmu Restoration1336 The Ashikaga Shogunate overthrew The Kenmu Restoration1392 The Ashikaga Shogunate absorbed remnants of Nanboku-chō (the Southern Court)1600 The Tokugawa Shogunate overthrew The Toyotomi Regime