Decline and domination of Ayutthaya
The Sukhothai domination was, however, short-lived. After the death of Ramkhamhaeng in 1298, Sukhothai's tributaries broke away. Ramkhamhaeng was succeeded by his son Loe Thai. The vassal kingdoms, first Uttaradit in the north, then soon after the Laotian kingdoms of Luang Prabang and Vientiane (Wiangchan), liberated themselves. In 1319 the Mon state to the west broke away, and in 1321 the Lanna absorbed Tak, one of the oldest towns under the control of Sukhothai. To the south, the powerful city of Suphanburi also broke free early in the reign of Loe Thai. Thus the kingdom was quickly reduced to its former local importance only. Finally in 1378, the armies from expanding Ayutthaya kingdom invaded and forced Sukhothai's King Thammaracha II submitted to this new power. After the Battle of Sittaung River in 1583, King Naresuan of Phitsanulok (and crown prince of Ayutthaya) forcibly relocated people from Sukhothai and surrounding areas to the Southern Central plain,[3] due to the war with the Burmese and an earthquake.