Lifespan: Eishō 13 (1516) (?) to Tenshō 10 (1582) (?)
Other Names: Arikiyo, Takekane, Jibu-shōyū, Hōki-no-kami, Tajima-no-kami
Clan: Yasuda (descended from the Jō clan of the Daijō lineage of the Kanmu-Heishi)
Lord: Nagao Tamekage → Nagao Harukage → Nagao Kagetora (Uesugi Kenshin) → Uesugi Kagekatsu
Father: Yasuda Sanehide (?)
Wife: Younger sister of Nagao Masakage
Yasuda Nagahide served as a bushō during the Sengoku period. He was a retainer of the Uesugi clan. Nagahide served as the lord of Yasuda Castle in the Shirakawa manor in the Kitakanbara District of Echigo Province.
The Yasuda were a gōzoku, or wealthy family, from northern Echigo and member of the Agakita Group. The Yasuda descended from the Jō clan, a branch of the Daijō lineage of the Kanmu-Heishi. Individuals with the same surname including Yasuda Kagemoto, Yasuda Akimoto, and Yasuda Yoshimoto also served as retainers of Uesugi Kenshin but were members of the Daiei-Yasuda clan, separate from Nagahide. Nagahide’s family (from the Daijō lineage) served as the lords of Yasuda Castle in the Kanbara District of Echigo. The Daiei-Yasuda clan served as the lords of a site also known as Yasuda Castle in the Kariwa District of Echigo. Based on their origins, Nagahide’s clan is also referred to as the Ōmi-Yasuda clan while the clan of Kagemoto and the others is also known as the Mōri-Yasuda clan.
Nagahide first appears in historical records in 1531. His signature appears as a member of a gōzoku affiliated with Nagao Tamekage. Thereafter, he appears in various places under the common name of Jibu-shōyū. In the genealogy of the Yasuda clan, he is shown under the name of Tajima-no-kami, but this name cannot be confirmed from other sources.
After supporting the Nagao clan during a revolt by Jōjō Sadanori, Nagahide served as a retainer of the Nagao and Uesugi clans. In particular, in 1561, at the Battle of Kawanakajima, he fought valiantly under Uesugi Masatora (Kenshin). Together with Irobe Katsunaga and Nakajō Fujisuke of the Agakita Group, he received a written commendation from Kenshin. In 1578, the death of Uesugi Kenshin triggered a succession struggle between two of his adopted sons, Uesugi Kagekatsu and Uesugi Kagetora. This is known as the Otate Conflict. During this event, Nagahide sided with Kagekatsu. Yasuda Castle was attacked by the Ashina clan who supported Uesugi Kagetora. Eventually, Kagekatsu prevailed and became the next head of the Uesugi clan.
The name Yasuda Jibu-shōyū associated with Nagahide last appears in records from 1581. Based on a genealogy compiled by his descendants who served the Yonezawa domain in the Edo period, his year of demise was 1582. The Yasuda clan was inherited by Yasuda Katachika, the third son of Kawada Motochika.
According to a genealogy prepared by Nagahide’s descendants at the end of the Edo period, Yasuda Nagahide (Jibu-shōyū, Tajima-no-kami) died in 1556 while the individual named Yasuda Jibu-shōyū who participated in the Battle of Kawanakajima as well as the Otate Conflict in 1578 was his son, Yasuda Arishige (Jibu-shōyū, Hōki-no-kami). Based on this same genealogy, Arishige’s mother was the younger sister of Nagao Masakage. His younger sisters became the wives of Gejō Tadachika and Yasuda Katachika. According to another record, Yasuda Katachika (who is regarded as the adoptee of Nagahide) is instead noted as the adoptee of Arishige. Arishige died on 4/8 of Bunroku 2 (1593). The graves of Nagahide and Arishige are at the Jōan Temple in the city of Yonezawa.
In 1555, Nagao Kagetora (later Uesugi Kenshin) deployed with his army to the Kantō to fight against Hōjō Ujiyasu. At this time, Nagao Masakage stayed to defend Kasugayama Castle. When Masakage sent a letter to Kagetora in regard to this assignment, Kagetora responded that he assigned Yasuda Nagahide as a messenger so to ask him in regard to any details.