Born a son of Hatakeyama Mochikuni. The Hatakeyama were one of the three kanrei houses. He grew up amid house strife and later fought Yoshinari for succession.
Kin rivalry brought Masanaga and Yoshinari into open conflict. Shogun Yoshimasa intervened; Hosokawa and Yamana were drawn in.
Briefly recognized as head and named kanrei. Conflict with Yoshinari continued; the post was unstable and ties with Katsumoto mattered.
The feud joined the Hosokawa-Yamana clash and sparked the Onin War. Masanaga sided with the eastern army in Kyoto street fighting.
After Katsumoto and Sozen died, fighting continued. Masanaga fought Yoshinari's side in Kawachi and Yamashiro in a quagmire over rule.
Major Kyoto fighting quieted and the Onin-Bunmei War ended, but Hatakeyama civil war continued in Kawachi.
After Onin he tried to hold Kinai status through the Hosokawa. Counterattacks and shifting politics kept his rule unstable.
Yamashiro locals drove both Hatakeyama armies out—the Yamashiro uprising. Masanaga had to abandon military hold there.
After Yoshinari's death, war with his sons continued in Kawachi. Masanaga worked with Masamoto to recover lands and was drawn again into Kyoto strife.
In the Meio Coup Yoshiki was deposed. Masanaga backed him, lost, and is said to have taken his own life at Shogaku-ji in Kawachi at fifty-two.
Yamana SōzenHosokawa KatsumotoAshikaga YoshimasaHosokawa Masamoto
Asakura Takakage (Toshikage)Hosokawa KatsumotoŌta DōkanAshikaga YoshimasaAshikaga YoshimiHino TomikoHosokawa MasamotoŌuchi Yoshioki
People of the Muromachi period ・ People by period
Based on facts found in textbooks and biographies. Uncertain points are marked as such.