Wikipedia
Narapati Sithu (, ; also Narapatisithu, Sithu II or Cansu II; 1138–1211) was king of Pagan dynasty of Burma (Myanmar) from 1174 to 1211. He is considered the last important king of Pagan. His peaceful and prosperous reign gave rise to Burmese culture which finally emerged from the shadows of Mon and Pyu cultures. The Burman leadership of the kingdom was now unquestioned. The Pagan Empire reached its peak during his reign, and would decline gradually after his death.
The reign saw many firsts in Burmese history. For the first time, the term Mranma (the Burmans) was openly used in Burmese language inscriptions. The Burmese script became the primary script of the kingdom, replacing Mon and Pyu scripts. The first Burmese customary law based on his grandfather Alaungsithu's judgments was compiled, and used as the common system of law for the entire kingdom. He founded the Royal Palace Guards, which later evolved to become the nucleus of the Burmese army in war time.
He encouraged further reforms of the Burmese Buddhism. By the efforts of his primate Shin Uttarajiva, the majority of the Burmese Buddhist monks realigned themselves with the Mahavihara school of Ceylon.