Ayutthaya (full name Phra Nakhon Si Ayutthaya, Thai: พระนครศรีอยุธยา, pronounced [pʰráʔ na.kʰɔ̄ːn sǐː ʔa.jút.tʰa.jāː] (Pronunciation); also spelled "Ayudhya") city is the capital of Ayutthaya province in Thailand. Located in the valley of the Chao Phraya 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.