In the place where Gattaran lies today were three former ecclesiastical towns: Nassiping, Dummun, and Gattaran proper. Nassiping is the oldest among the three, founded on June 15, 1596 with Santa Catalina as the patron saint; Dummun was founded on May 24, 1598 and Gattaran, May 20, 1623. Since each of these towns had few inhabitants and had only one priest to administer to their religious needs, they were merged for ecclesiastical convenience into one municipality in 1877 by virtue of a Diocesan Order from the Bishop of Nueva Segovia (Lallo). Fray Francisco Suejos, O.P. was the first Gobernadorcillo.
During the Spanish regime, the natives grew spiritually; but with the Americans, they grew educationally and the inhabitants assimilated a more sophisticated lifestyle. Under the Commonwealth Government, the first Municipal Mayor was Melencio Adviento, who begun the construction of the present municipal building. The building was finished during the term of the next mayor, Atty. Hipolito Mandac. The municipal building was inaugurated in September, 1941. Four months after its inauguration, World War II broke out, the Japanese Forces occupied the town and all records, cadastral titles and others were confiscated by the invading forces.
With the coming of the Americans, the whole province was liberated from the Japanese forces. The first election of the Republic in 1947 made Delfino Liban the mayor. The administration marked the building of roads in the barrios, improvements of streets and others.
Gattaran also boasts of historic spots which makes it a tourist landmark, like the Maduppaper Caves, the Mapaso Hot Spring and the Tanlagan Falls whose warm and cold waters meet and flow together on one bed to become the Dummun River. Another pride of Gattaran is Bolos Point, a wildlife sanctuary.