The Kingdom of Champasak (1713-1946) was a kingdom in southern Laos that broke away from the Lan Xang kingdom in 1713. Champasak prospered at the beginning the 18th century, but it was reduced to a vassal state of Siam before the century had passed. Under French rule the kingdom was known as Bassac and became an administrative block with its royalty stripped of many of its privileges. The Kingdom of Champasak was abolished in 1946 when the Kingdom of Laos was formed.