Songtham or Intharacha III was the King of Ayutthaya from 1610/11 to 1628 of the House of Sukhothai. His reign marked the prosperity of the Ayutthaya kingdom after it regained independence from Toungoo Dynasty, and saw the commencement of trade with foreign nations, especially the Dutch and the Japanese. Songtham filled his guards with foreign mercenaries, most notably the Japanese, Yamada Nagamasa.

The Ayutthaya Kingdom or the Empire of Ayutthaya was a Mon and later Siamese kingdom that existed in Southeast Asia from 1351 to 1767, centered around the city of Ayutthaya, in Siam, or present-day Thailand. European travellers in the early 16th century called Ayutthaya one of the three great powers of Asia. The Ayutthaya Kingdom is considered to be the precursor of modern Thailand, and its developments are an important part of the history of Thailand.