He was the 21st chief of the Chōsokabe clan of Tosa Province (present-day Kōchi Prefecture). He was the son and heir of Chōsokabe Kunichika and his mother was a daughter of the Saitō clan of Mino Province.
In the 1562 Battle of Asakura Chosakabe Motochika defeated Motoyama Shigetoki and gained control of Shikoku Island. He then went on to take Aki Castle in the 1569 Siege of Aki. In the 1575 Battle of Shimantogawa, he defeated the Ichijo family.
Battle of Watarigawa and Conflict with Hideyoshi
This included the 1582 Battle of Nakatomigawa and the Battle of Hikita.:233 However, in 1585, Hashiba (later Toyotomi) Hideyoshi invaded that island with a force of 100,000 men, led by Ukita Hideie, Kobayakawa Takakage, Kikkawa Motonaga, Hashiba Hidenaga, and Hashiba Hidetsugu. Motochika surrendered, and forfeited Awa, Sanuki, and Iyo Provinces; Hideyoshi permitted him to retain Tosa.
Service under Hideyoshi
Under Hideyoshi, Motochika and his son Nobuchika participated in the invasion of neighboring Kyūshū, in which Nobuchika died. In 1590, Motochika led a fleet in the Siege of Odawara, and also fought in the Japanese invasions of Korea in 1592.
- Father: Chōsokabe Kunichika (1504–1560)
- Mother: Daughter of the Saitō clan
- Wife: Lady Motochika (died 1583)
- Concubine: Koshōshō, or Lady Ōgata
In popular culture
Motochika is a playable character from Samurai Warriors 2 onwards, where he wields a shamisen, he continuously calls himself as "The Bat King", due to Nobunaga historically referring to him as a "the bat who refuses to fly away from its home".
Motochika is also a playable character in the Sony PlayStation game, Sengoku Basara where he wields an anchor and appears as a pirate. He also appears in the anime adaptation of the game Sengoku Basara: Samurai Kings.
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- 亀岡龍太 (December 11, 2010). "mytown.asahi.com/areanews/kochi/OSK201012100141.html" [Chōsokabe clan documents on display at Tosa Yamauchi Family Treasury and Archives beginning on the 11th] (in Japanese). Asahi.com My Town. Archived from the original on August 23, 2011. Retrieved August 22, 2011.
- Turnbull, Stephen (1998). The Samurai Sourcebook. Cassell & Co. p. 216,218,227. ISBN 1854095234.
- "Motochika + Dewott - Pokemon Conquest characters". Pokemon. Retrieved 2012-06-17.
- "Characters in SW2 xtreme legend".
- 新井政義（編集者）『日本史事典』。東京：旺文社 1987 (p. 263)