Phommathat was the fourth king of Lan Xang (Laos) (ruled 1428–1429). He was Lan Kham Deng's oldest son. He was king for only 10 months. He was assassinated by Nang Keo Phimpha. He was succeeded by Yukhon. Family Father: Lan Kham Deng - King of Lan Xang (r.1416-1428) Mother: Queen Nang Kaeva Buma Fa (Keo Poum Fa) Consorts and their Respective Issue: by unknown women Prince Kaya Bunabarna (Kay Bona Ban) - died in 1428 on the orders of his grandmother, Nang Keo Phimpha References Kings of Lan Xang Year of birth unknown 1429 deaths 15th-century Laotian people 15th-century monarchs in Asia Laotian Theravada Buddhists Executed monarchs Executed Laotian people People executed by Laos by decapitation