The History of Rome (1.1.8-1.2.1)

When he heard that the men were Trojans, that their leader was Aeneas, the son of Anchises and Venus, that their city had been burnt, and that the homeless exiles were now looking for a place to settle in and build a city, he was so struck with the noble bearing of the men and their leader, and their readiness to accept alike either peace or war, that he gave his right hand as a solemn pledge of friendship for the future.

A formal treaty was made between the leaders and mutual greetings exchanged between the armies. Latinus received Aeneas as a guest in his house, and there, in the presence of his tutelary deities, completed the political alliance by a domestic one, and gave his daughter in marriage to Aeneas.

This incident confirmed the Trojans in the hope that they had reached the term of their wanderings and won a permanent home.

They built a town, which Aeneas called Lavinium after his wife. In a short time a boy was born of the new marriage, to whom his parents gave the name of Ascanius.

In a short time the Aborigines and Trojans became involved in war with Turnus, the king of the Rutulians. Lavinia had been betrothed to him before the arrival of Aeneas, and, furious at finding a stranger preferred to him, he declared war against both Latinus and Aeneas.