Ratsadanay

[[File:Champassak-Bua Laphan Ratsadany.jpg|thumb|King Ratsadanay (1874-1945). H.R.H. Somdet Brhat Chao Buvanarabarna Rajadhanaya Negara Champasakti [Bua Laphan Ratsadany], Prince of Champasakti.]] King Ratsadanay (1874–1945) was the last king of Champasak. He was the father of Boun Oum.

Upon the death of his father, he was appointed as Chao Muang Nakhon Champassak (Prince Governor of the State of Champasakti) by the King of Siam on 28 July 1900 and invested with the personal title of Somdet Brhat Chao Buvanarabarna Rajadhanaya Negara Champasakti. He was forced to accept French protection when Siam transferred sovereignty to the French Republic on 19 September 1904, under the terms of the Franco-Siamese Treaty of 13 February 1904. The principality was abolished by the French on 22 November 1904, although he retained his styles, titles and honours for life.