Ashikaga Ujimitsu (足利氏満) (1359–1398) was a Nanboku-chō period warrior and the Kamakura-fu's second Kantō kubō, or Shōgun Deputy. Son of first Kantō Kubō Ashikaga Motouji, he succeeded his father in 1367 at the age of nine when this last suddenly died during an epidemic. It was during his reign that the Kanto kubō title became common enough to appear for the first time in writing. It is in fact contained in a 1382 entry of the Tsurugaoka Jishoan (鶴岡事書安). This title was in itself rebellious, because it was first adopted by Takauji himself and its use therefore implied equality with the shogun.[1] In fact, sometimes the Kanto Kubō was called Kantō shōgun.[1]
Ujimitsu was the first Kantō kubō to openly aspire to the shogunate, and his relationship with shōgun Ashikaga Yoshimitsu in Kyoto consequently deteriorated to the point of being likened to that of "cats and dogs".[2]