Lifespan: 15xx to 15xx
Rank: bushō, shugo daimyō
Title: Chief of the Right Division of Outer Palace Guards
Clan: Sōshū-Hatakeyama (founded by Hatakaeyama Yoshinari)
Bakufu: Muromachi – Military Governor of Kawachi
Father: Hatakeyama Yoshihide
Siblings: Yoshitaka, Ariuji, Katusō (adopted son of Hatakeyama Hisanobu)
Hatakeyama Ariuji served as a bushō and shugo daimyō during the Sengoku period. Ariuji was the military governor of Kawachi Province. His common name was Shōjirō and he held the title of Chief of the Right Division of Outer Palace Guards. Ariuji was the sixth head of the Hatakeyama-Sōshū family (founded by Hatakeyama Yoshinari). He was either the son or younger brother of Hatakeyama Yoshitaka, but, based on the birth year of his son, Hatakeyama Naomasa, it is likely that Ariuji was the younger brother of Yoshitaka.
After a retainer named Kizawa Nagamasa turned to serve Hosokawa Harumoto, Yoshitaka attacked Nagamasa at his base at Iimoriyama Castle. This invited an attack by the Ikkō-ikki in the sixth month of 1532 by which Yoshitaka was forced to kill himself. For a while thereafter, Ariuji received the backing of Nagamasa to serve as the head of the Hatakeyama-Sōshū family, appearing in records in this role from the first month of 1533. After Harumoto’s governance stabilized in 1537, he issued a letter to the Kanshin Temple acknowledging their rights to their lands, acting as the head of the clan.
Within the Hatakeyama-Sōshū, the Yusa clan had for generations served as the deputy military governors, but, in the era of Ariuji, this role was held by Nagamasa. Meanwhile, Nagamasa’s younger brother, having the title of nakatsukasa-taifu, or Vice Minister of Central Affairs, became a magistrate for the military governor, while Nagamasa’s father, Kizawa Fuhan, was a member of the influential group of retainers known as the uchishu, or inside group. Accordingly, the real power in the family was held by a Nagamasa, giving the appearance of a puppet administration.
Ariuji settled with the Hatakeyama-Bishū family (founded by Hatakeyama Masanaga) which for generations until the era of Yoshitaka had quarreled with the Hatakeyama-Sōshū. Ariuji aligned with Hatakeyama Harumitsu (the head of the Bishū family) and a senior retainer of Harumitsu named Yusa Naganori to split the governance of Kawachi Province. In 1541, after Nagamasa rebelled against Hosokawa Harumoto, Ariuji did not actively support the effort and remained in Iimoriyama Castle. This appears to be because he did not underestimate the power of Nagamasa exceeding that of the family of the military governor.
In 1542, Nagamasa was killed in action against the bakufu army at the Battle of Taihei Temple. Owing to his complicity, Ariuji was also attacked at Iimoriyama Castle by the bakufu army, leading to negotiations with the bakufu that ultimately failed. In the first month of 1543, Iimoriyama Castle fell.
Thereafter, he maintained authority in Kawachi, Kii, and the Uchi District of Yamato. In the second month of 1547, Ariuji served the Harumoto administration during a rebellion by Hosokawa Ujitsuna. In the seventh month, he contributed to the victory by Harumoto’s forces at the Battle of Shari Temple. On 5/9 of Tenbun 18 (1549), he lost in battle against forces led by Miyoshi Nagayoshi and Yusa Naganori who allied with Ujitsuna.
In the ninth month of 1555, he issued a letter acknowledging the rights of the Shinkan Temple in Kawachi to their lands, but his whereabouts thereafter are unknown.