government was moved from Khun Yuam to Yuam and the administrative division was renamed from Western Chiang Mai to Northern Phayap.In 1910, a royal decree saw the merging of Mae Hong Son, Yuam and Pai into a fourfold realm alongside the Mandala of Phayap, and moved the administrative capital to Mae Hong Son with Phraya Sonsurarat (Plueng) as the first Governor of Mae Hong Son Province. In 1933, governance as a territory was ceased and then reinstated as a constitutional administrative government as per the Constitution of the Kingdom of Thailand as remains in place today
