Yasutada YANAGISAWA became a retainer of the Dainagon (chief councilor of state) Tadanaga TOKUGAWA (a son of Hidetada TOKUGAWA) of Suruga Province, but when Tadanaga was placed under house arrest by his elder brother Iemitsu TOKUGAWA, Yasutada became a warrior without a lord.
柳沢安忠のときに駿河国大納言徳川忠長（徳川秀忠の子）の家臣となったが、忠長が兄徳川家光によって蟄居・幽閉に処せられたため浪人になった。