Laos traces its history to the kingdom of Lan Xang, which existed from the 14th to the 18th century when it split into three kingdoms. In 1893, it became a French protectorate, with the three kingdoms—Luang Phrabang, Vientiane and Champasak — uniting to form what is now known as Laos. It briefly gained independence in 1945 after Japanese occupation, but returned to French rule until it was granted autonomy in 1949. Laos became independent in 1953, with a constitutional monarchy under Sisavang Vong. Shortly after independence, a long civil war ended the monarchy, when the Communist Pathet Lao movement came to power in 1975.