Tristan is the son of Meliodas and Elizabeth Liones, and currently the prince of the Kingdom of Liones. At 10 years old, on his birthday, he met Lancelot, Ban and Elaine's son, they fought and the Lancelot's scar on the forehead was caused by Trsitan himself. In Mokushiroku No Yonkishi, he's one of the Knights of Apocalypse with Percival, Lancelot and Gawain. In 4KOA his personality is so talkative, kind and a little naive.