Sukhothai Kingdom
In Sukhothai Kingdom era, "Mueang" Kosamphi was a satellite city of the frontier city Mueang Chakangrao (Kamphaeng Phet), at same level as "Mueang" Nakhon Chum, Trai Trueng, Phan, and Phangkha. Archaeological evidence of the ancient city was found in Ban Khlong Mueang, "Tambon" Kosamphi.