Before the Battle of Sekigahara, Ieyasu TOKUGAWA proposed marriage between Yukinaga's legitimate son and a grand daughter of Ieyasu's legitimate son Nobuyasu MATSUDAIRA and it implies that Ieyasu wanted the strong navy and war potential owned by Yukinaga.
徳川家康は、関ヶ原の戦い前に行長の嫡男と家康の嫡男・松平信康の孫娘との結婚を持ちかけており、行長の有する強大な水軍、戦力を手に入れておきたかったことが窺える。