Trinovantum, in medieval British legend, is the name given to London in earliest times. According to Geoffrey of Monmouth's Historia Regum Britanniae (1136) it was founded by the exiled Trojan Brutus, who called it Troia Nova ("New Troy"), which was gradually corrupted to Trinovantum. It was later rebuilt by King Lud, who named it Caer Lud ("Lud's Fort") after himself, and this name became corrupted to Kaer Llundain, and finally London.