|Bronze statue of Yamauchi in Kochi|
|Lord of Kakegawa|
|Succeeded by||Matsudaira Sadakatsu|
|Lord of Tosa|
|Preceded by||Chōsogabe 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 Moritoyo in Owari Province at the end of the Sengoku period of Japan. Kazutoyo held the title of Tosa no kami.
Kazutoyo served under Oda Nobunaga between 1565 to 1582, the year Nobunaga was killed. Kazutoyo fought in the Battle of Anegawa, as well as the Battle of Nagashino. After the death of Nobunaga, Kazutoyo stayed on as a vassal under Toyotomi Hideyoshi. In doing so, he was rewarded with a 50,000-koku fief at Kakegawa. In the Battle of Sekigahara in 1600, Kazutoyo supported Tokugawa Ieyasu, leading more than 2,000 men in that battle, and captured Gifu Castle as a result. As a reward for his achievements, Kazutoyo was given the Tosa Domain. To bring certain unruly warriors of Tosa into line, Kazutoyo called on the assistance of Ii Naomasa, who sent Suzuki Hyoe for this purpose.
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.
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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|Lord of Nagahama
|Lord of Kakegawa
|Lord of Tosa
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