[8] Seimu appointed one of his nephews to be crown prince before his death in 190 AD, marking the first of later generations which would cede the throne to a non-direct successor.

[2] Seimu's death marked an end of direct lineage from legendary Emperor Jimmu, and was the first split branch of others that later followed.

It is much more likely that he was a chieftain, or local clan leader, and the polity he ruled would have only encompassed a small portion of modern-day Japan.

[13] His name might have been regularized centuries after the lifetime ascribed to Seimu, possibly during the time in which legends about the origins of the imperial dynasty were compiled as the chronicles known today as the Kojiki.

[14] While the actual site of Seimu's grave is not known, the Emperor is traditionally venerated at a memorial Shinto shrine (misasagi) at Nara.

The Imperial Household Agency designates this location as Seimu's mausoleum, and is formally named Saki no Tatanami no misasagi.

[12] Unless otherwise noted (as BC), years are in CE / AD  * Imperial Consort and Regent Empress Jingū is not traditionally listed.