Ise Sōzui (伊勢 宗瑞; 1432 or 1456 – September 8, 1519), also known as Hōjō Sōun (北条 早雲), was a Japanese daimyo and the first head of the Later Hōjō clan, one of the major powers in Japan's Sengoku period. Although he only belonged to a side branch of the more prestigious Ise family, he fought his way up, gaining territory and changing his name in imitation of the illustrious Hōjō.
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Biography
Traditionally Soun held a reputation of a rōnin who rose to power almost overnight in Kantō; however, he belonged to a prestigious family in the direct employment of the Ashikaga shogunate, and enjoyed important family connections. It has been said that Sōun was born at the Takakoshi castle in Okayama. His sister was married to Imagawa Yoshitada, a major daimyō from a prestigious cadet branch of the Ashikaga family.
About 1475, under the cognomen of Ise Shinkuro, he worked for Imagawa, the constable of Suruga Province, and eventually became an "independent leader" with a number of warriors joining him.
Shinkuro became a retainer in the Imagawa clan, and when Yoshitada died in battle in 1476, Shinkurō mediated the succession dispute between supporters of Yoshitada's son Imagawa Ujichika and Yoshitada's cousin, Oshika Norimitsu. This proved a temporary peace. When Norimitsu again attempted to gain control of the Imagawa clan, Sōun came to Ujichika's defense, killing Norimitsu. Sōun was rewarded by Ujichika with Kōkokuji Castle.
In 1491, he was able to take Horigoye after the death of Kantō kubō Ashikaga Masatomo, gaining control of Izu Province. He then adopted the given name of Sōun or Sozui.