The place was formerly called Bucao, named after the first Tingguian (Itneg) chieftain who settled in the place long before Spanish colonization. It was formerly part of the Municipality of Tayum. In 1882, upon the recommendation of the parish priest of Tayum, Fr. Pio Mercado, and the Teniente Bazar of Bucao, Don Ignacio Eduarte, Bucao was created as a separate pueblo. In 1885, Bucao was renamed Dolores, in honor to its patron saint, the Nuestra Señora delos Dolores (Our Lady Of Sorrows). The first gobernadorcillo of the town was Don Rosalio Eduarte.