It is a 3rd class municipality in the province of Camarines Sur, Philippines.

Bato was formerly called as "Kaliligno" or "Caligno" named by the natives that settled along the river area.

 

This small village later was elevated into a status of a town under the decree of Spanish Superior Government on February 15, 1753. Years back, a parish was already existing which was also made under the same decree. This parish adopted the "The Most Holy Trinity" as its patron which its feastday is celebrated every Sunday after the Pentecost.

 

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Source:

Wikipedia.org