Lan Xang
Lan Xang existed as a sovereign kingdom for over 350 years. The first serious foreign invasion came from the Dai Viet in 1479, which was defeated, though leaving the capital of Luang Prabang largely destroyed. The first half of the sixteenth century allowed for the power, prestige and cultural influence of the kingdom to be restored under a series of strong kings (see Souvanna Balang, Vixun, Photisarath). In the 1540s a series of succession disputes in the neighboring Kingdom of Lanna, created a regional rivalry between Burma, Ayutthaya and Lan Xang. In 1540 Lan Xang defeated an incursion from Ayutthaya. By 1545 the Kingdom of Lanna was attacked by the Burmese and then Ayutthaya. Lan Xang entered into an alliance with Lanna, and aided in the defense of the kingdom. In 1547 the kingdoms of Lan Xang and Lanna were briefly unified under Photisarath of Lan Xang and his son Setthathirath in Lanna. Setthathirath would go on to become the king of Lan Xang on the death of his father, and become one of the greatest kings of Lan Xang.