Ayutthaya Kingdom and Sukhothai Kingdom

The Ayutthaya Kingdom or the Empire of Ayutthaya was a Thai 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 alongside Vijayanagara and Ming China. Ayutthaya is considered the precursor of modern Thailand.

The Sukhothai Kingdom was a post-classical Siamese kingdom (maṇḍala) in Mainland Southeast Asia surrounding the ancient capital city of Sukhothai in present-day north-central Thailand. The kingdom was founded by Si Inthrathit in 1238 and existed as an independent polity until 1438, when it fell under the influence of the neighboring Ayutthaya after the death of Borommapan (Maha Thammaracha IV).