Original sentence: Many other Thai statelets coexisted with Sukhothai, most notably the northern kingdom of Lannathai or Lanna.The city briefly dominated the area of modern Thailand under King  Ramkhamhaeng, but after his death it fell into decline and became subject to the Ayutthaya kingdom in 1365, which dominated southern and central Thailand until the 1700s.This state emerged in the same period as Sukhothai, but survived longer
Edited sentence: Many other Thai statelets coexisted with Sukhothai, most notably the northern kingdom of Lannathai (or just Lan Na).The city briefly dominated the area of modern Thailand under King  Ramkhamhaeng, but after his death it fell into decline and became subject to the Ayutthaya kingdom in 1365, which dominated southern and central Thailand until the 1700's.This state emerged in the same period as Sukhothai, but survived longer because of able kings like its first king, [b]Mangrai[/b]