元寇
He installed Hōjō Nagatoki as "shikken" while designating his son Tokimune to succeed as "tokusō". Effective power was moved from "shikken" to "tokusō". Tokimune, contemporaneous with Mongol invasions of Japan, at one point personally occupied all 3 most powerful posts of the shogunate, and thus Japan: "tokusō", "shikken", and "rensho".