The low - lyting plane around Ping River and Wang River in Chiengmai, Lampoon, and Lampang provinces was formerly known as" Samandra Pradesh" and "Pinkarath", in which were situated two important cities as "Haribhunchai" (Lampoon) and "Khelangkanakara" (Lampang) respectively.          Haribhunchai (Lampoon) was the name of the state that had maintained close relationship with lawo (Lopburi) before 17th century B.E. unti 18th century B.D.; ith then disintegrated underthe might of King Mungrai, the ruler of "Yonok" the city which situated on the low - lying plane in Chiengrai Province - who, having captured Haribhunchai, established Chiengmai as a new government centre. He then started to unify the upper northern territories and completed the task in the subsequeng century. The unified teritory was known as "Lanna". History of the Museum          Haribhuchai National Museum at Lampoon Province was established in B.E. 2470 by Praya Rachanakulvibulbhakdi, Governor of Monthon Phayap. Later the Department of Fine Arts was entrusted the responsibility of overseeing its operation. In B.E. 2517 a new building was erected for the purpose of exhibiting its archaeology and history aready mentioned.