Tenasserim

Tenasserim was a coastal region on the western Malay Peninsula, with ports facing the Andaman Sea. After Pagan fell in 1287 it passed to Sukhothai, whose vassal it remained in 1337.

The Siamese founded the walled port of Tenasserim in 1383; with Tavoy and Mergui it served Ayutthaya's Indian Ocean trade. Bayinnaung of Toungoo conquered the coast in 1564. Ayutthaya recovered the south by 1599, but Anaukpetlun retook the north in 1614. The Konbaung dynasty seized the coast between 1760 and 1765, and ceded it to Britain by the Treaty of Yandabo in 1826.