Historia Regum Britanniae
Geoffrey of Monmouth's account tells much the same story, but in greater detail. In this version, Brutus is explicitly the grandson, rather than son, of Ascanius; his father is Ascanius' son Silvius. The magician who predicts great things for the unborn Brutus also foretells he will kill both his parents. He does so, in the same manner described in the Historia Britonum, and is banished. Travelling to Greece, he discovers a group of Trojans enslaved there. He becomes their leader, and after a series of battles they defeat the Greek king Pandrasus by attacking his camp at night after capturing the guards. He takes him hostage and forces him to let his people go. He is given Pandrasus's daughter Ignoge in marriage, and ships and provisions for the voyage, and sets sail.
The Trojans land on a deserted island and discover an abandoned temple to Diana. After performing the appropriate ritual, Brutus falls asleep in front of the goddess's statue and is given a vision of the land where he is destined to settle, an island in the western ocean inhabited only by a few giants.
After some adventures in north Africa and a close encounter with the Sirens, Brutus discovers another group of exiled Trojans living on the shores of the Tyrrhenian Sea, led by the prodigious warrior Corineus. In Gaul, Corineus provokes a war with Goffarius Pictus, king of Aquitaine, after hunting in the king's forests without permission. Brutus's nephew Turonus dies in the fighting, and the city of Tours is founded where he is buried. The Trojans win most of their battles but are conscious that the Gauls have the advantage of numbers, so go back to their ships and sail for Britain, then called Albion. They meet the giant descendants of Albion and defeat them.
Brutus renames the island after himself and becomes its first king. Corineus becomes ruler of Cornwall, which is named after him. They are harassed by the giants during a festival, but kill all of them but their leader, the largest Giant Gogmagog, who is saved for a wrestling match against Corineus. Corineus throws him over a cliff to his death. Brutus then founds a city on the banks of the River Thames, which he calls Troia Nova, or New Troy, siting his palace where is now Guildhall and a temple to Diana on what is now St Paul's (with the London Stone being a part of the altar at the latter). The name is in time corrupted to Trinovantum, and is later called London. He creates laws for his people and rules for twenty-four years. He is buried at a temple at Tower Hill. After his death the island is divided between his three sons, Locrinus (England), Albanactus (Scotland) and Kamber (Wales).
Read more about this topic: Brutus Of Troy