The Sessho(摂政) is a title of regent given to one who is named to assist an emperor when the emperor is still a child, or before the coming of age or female.
The Kanmpaku (関白) is a title of regent who assists an adult emperor.
Mostly, the Sessho and Kampaku had an practical power over the ruling Emperor, conducting cloistered rule.
The Fujiwara family dominates the title as well as a title of Sessho. The retired kampaku is called Taiko(太閤), which became dominately to refer to as Toyotomi Hideyoshi.
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