Since during the period of the Tokugawa shogunate the Matsui family had been maintaining their possession in Yamashiro Province which had been given by Hideyoshi before the period of the Tokugawa, it can be said that the Matsui family was a rare family which kept the status of direct vassal of the Tokugawa shogunate as well as the status of indirect vassal at the same time.
秀吉から与えられた山城国の領地は徳川幕府の下でも維持されており、松井家は徳川幕府の直臣・陪臣の性格を併せ持つ特殊な家であった。