FTP, name this Asian nation which was home to a communist group with the word "Pathet" in its name, and which is ruled from Vientiane.
Its second ruler was given a posthumous name referring to a census he instituted which listed the names of 300,000 men who could fight in his army.  That ruler, Oun Hueun, succeeded his father Fa Ngum in 1373 as ruler of a state which was known as the "Kingdom of a Million Elephants."  Its notable rulers included Setthathirath and Souligna Vongsa, though after the latter's death it was split into the three kingdoms of Champassak, Luang Prabang, and Vien Chan.  In the 20th century, it was ruled by a People's Revolutionary Party after 1975, and has been led by men like Kaysone Phomvihan and Khamtai Siphandon.  FTP, name this Asian nation which was home to a communist group with the word "Pathet" in its name, and which is ruled from Vientiane.
Its second ruler was given a posthumous name referring to a census he instituted which listed the names of 300,000 men who could fight in his army.  
Laos (accept Lan Xang prior to mention of the "20th century")