The ancient city of Ayutthaya or Phra Nakhon Si Ayutthaya, was the capital of Thailand for 417 year. The city was founded in 1350 by King U-Thong. Thirty-three Kings ruled the kingdom, until1767when the Burmese sacked the city. Ayutthaya is now a major tourist attraction because there are many ancient ruins that show the greatness of Ayutthaya in the past. Pra Nakhon Si Ayutthaya Historical Park in central Ayutthaya has been a UNESCO World Heritage site since 13 December, 1999.