Production begun in the 13th century AD, possibly with the decline of Khmer ceramics. During the 15th century China was faced with an important crisis, opening the opportunity for Sukhothai ceramics to conquer export markets. Sukhothai wares have been found in Indonesia, the Philippines and China among other countries. They were a very important article of trade. Major collections have been found in sunken vessels around the gulf of Thailand, still in good condition after centuries under water.