Kingdom of Vientiane
In 1779, under the reign of King Setthathirath II of Lan Xang, Kitsarat, an heir of Sourigna Vongsa, declared separation of Luang Prabang. He marched on Vientiane to attack Setthathirath. King Setthathirath II turned to Ayutthaya for help. The Siamese army helped defend Vientiane but cannot stop Kitsarat to form his own kingdom. Kitsarat crowned the king in 1707, creating the Kingdom of Luang Phrabang,converting Lan Xang into the Kingdom of Vientiane. The kingdoms of Champasak and Muang Phuan also seceded during the following years.