Sanshuro, which literally means three high-ranking officials called Churo, were the posts established in the last days of the Toyotomi Administration, allowing those three men in the posts to participate in politics, and to mediate between Gotairo and Gobugyo when they cannot agree.
三中老(さんちゅうろう)は豊臣政権末期に制定された役職で、政事に参与し、五大老と五奉行との意見が合わないときの仲裁役であった。