Borommatrailokkanat (Thai:บรมไตรโลกนาถ) or Trailok (1431–1488) was the king of the Ayutthaya Kingdom from 1448 to 1488. He was one of many monarchs who gained the epithet King of White Elephants (Thai:พระเจ้าช้างเผือก). He was the first Thai king to possess a "noble" or white elephant, which, according to Hindu belief, was a "glorious and happy sign". His reign was also known for a massive reforms of Thai bureaucracy and a successful campaign against Lan Na. He was also revered as one of the greatest monarchs of Thailand.