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Mark Gatiss is an English actor, writer, and director. He has appeared in many popular television shows, including Sherlock, Doctor Who, and Game of Thrones. In Game of Thrones, Gatiss played the role of Tycho Nestoris, a Braavosi banker who is a member of the Iron Bank. Gatiss's character is a shrewd businessman who is not afraid to use force to get what he wants.