The Lan Na Kingdom or The Kingdom of Lanna, also known as Lannathai, and most commonly called Lanna or Lanna Kingdom, was an Indianized state centered in present-day Northern Thailand from the 13th to 18th centuries.

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.