Kazutoyo lived during the end of the Sengoku period (1546-1605). He was the first feudal lord of the fief of Tosa on the island of Shikoku. He served Nobunaga Oda, Hideyoshi Toyotomi and Tokugawa Ieyasu. Chiyo (1557-1617) was his wife, and was known in history for her dedication and devotion to her husband (like Matsu was to Toshiie in Toshiie to Matsu). She is the daughter of a samurai who served the feudal lord Asai.