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.

Kam Mueang or Northern Thai language is the language of the Northern Thai people of Lanna, Thailand. It is a Southwestern Tai language that is closely related to Tai Lue language. Kam Mueang has approximately six million speakers, most of whom live in the native Northern Thailand, with a smaller community of Lanna speakers in northwestern Laos.