1820s
Burmese visiting Chiangmai
Since its founding in the late 13th century, the kingdom of Lanna or Chiangmai (Zinme in Burmese) was an independent kingdom for most of its history. The people of Chiangmai traditionally speak a Tai dialect very similar to the one spoken in Kengtung and other eastern Shan states. For most of the period 1558–1775, Chiangmai was under Burmese rule. In the 19th century, the region then came under the control of Bangkok's current dynasty.
This image is part of a larger mural at Wat Phra Singh in Chiang Mai showing a Burmese (perhaps trade) delegation to Chiangmai c. 1820.