Gosanke, especially the Owari and Kishu families, were competitive against each other over the succession of shogunate, and it is believed that Yoshimune, who was from the Kishu family, and Muneharu TOKUGAWA, who was the head of the Owari family, were at odds, with the Owari family suspected to have poisoned Yoshimune.
御三家同士、特に尾張家と紀州家の間には将軍職の継承を巡って競争意識があり、紀州家出身の将軍吉宗と尾張家当主徳川宗春の間には吉宗の毒殺疑惑があり確執があったとされている。