In 1424 A.D. King Intharachathirat passed away. His twosons, Chao Aye Phraya who reigned over Suphanburi, and Chao Yi Phraya who reigned over Sanburi met in battle as each desired the throne. This took place at the approach to the Pa-Tha Bridge in Ayutthaya and ended with the death of both sons. A third son, Chao Sam Phraya, came down from Phitsanulok andacceded to the throne whereupon he declared his intention to organize a funeral for his father and his two brothers. Afterwards he odered the building of a wat, namely What Ratchaburana, at the site of the cremation. At the place where his brothers fought and died he had two chedis created in which to keep their ashes.