T'vis was a Klingon warrior, the son of Barot. In 2373, he was among those invited to Ty'Gokor to receive the medallion of the Order of the Bat'leth by Klingon chancellor Gowron. Later at the event, he witnessed the revealing that Martok was in fact a Changeling. (DS9: "Apocalypse Rising") T'vis was played by Raymond Stewart. According to the script, his name was pronounced as "tuh-VIS" [1]