Ayutthaya (full name Phra Nakhon Si Ayutthaya, also spelled "Ayudhya") city is the capital of Ayutthaya province in Thailand. Located in the valley of the Chao Phray River. The city was founded in 1350 by King U Thong, who went there to escape a smallpox outbreak in Lop Buri and proclaimed it the capital of his kingdom, often referred to as the Ayutthaya kingdom or Siam. Ayutthaya became the second Siamese capital after Sukhothai.