The death of Lan Kham Daeng ushered in a period of uncertainty and regicide. from 1428 to 1440 seven kings ruled Lan Xang, all were killed by assassination or intrigue guided by a Queen known only by her title as "Maha Devi" or as "Nang Keo Phimpha" "The Cruel". It is possible that from 1440 to 1442 she ruled Lan Xang as the first and only female leader, before being drowned in the Mekong in 1442 as an offering to the naga. In 1440 Vientiane revolted, but despite the years of instability the capital at Muang Sua was able to suppress the rebellion. An interregnum began in 1453 and ended in 1456 with the crowning of King Chakkaphat (1456–1479).