Bronze statue of Yamauchi in Kochi
|Lord of Kakegawa|
|Succeeded by||Matsudaira Sadakatsu|
|Lord of Tosa|
|Preceded by||Chōsokabe Morichika|
|Succeeded by||Yamauchi Tadayoshi|
Owari Province, Japan
|Died||November 1, 1605|
Yamauchi Kazutoyo (山内 一豊 （やまうち かつとよ）), also spelled Yamanouchi (1545/1546? – November 1, 1605), was born the son of Yamanouchi Toyonao in Owari Province at the end of the Sengoku period of Japan. Kazutoyo held the title of Tosa no kami.
Just four years after he became Lord of Tosa, Kazutoyo died without issue aged around 60, and was succeeded as Lord of Tosa by his nephew Tadayoshi.
- Father: Yamanouchi Toyonao (1510-1559)
- Mother: Hoshuin (d.1586)
- Wife: Yamauchi Chiyo (1557-1617) later Genshoin
- Daughter: Yonehime (1580-1586)
- Shonan Shoka (1586-1637)
- Yamauchi Tadayoshi (1592-1665)
The 45th NHK Taiga drama (2006) is a dramatization of the life of Kazutoyo, with his wife Chiyo as the central character. Kōmyō-ga-tsuji: Yamauchi Kazutoyo no Tsuma stars Nakama Yukie as Chiyo. Takaya Kamikawa plays Kazutoyo. The story tells how Chiyo, as a wise and beautiful wife, helped her husband Yamauchi Kazutoyo up from an ordinary samurai to the governor of an entire province, Tosa. The story is by Shiba Ryōtarō.
- Tabata Yasuko 田端泰子. Yamanouchi Kazutoyo to Chiyo: Sengoku bushi no kazokuzō 山內一豊と千代 : 戦国武士の家族像. Tokyo: Iwanami Shoten 岩波書店, 2005.
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| Daimyō of Nagahama
| Daimyō of Kakegawa
| Daimyō of Tosa
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