Duero is a fifth class municipality in the province of Bohol, Philippines. According to the 2010 census, it has a population of 17,580 people. It was named after the Duero River in the Iberian peninsula.
Roman Catholicism was introduced to the town in 1860 by a Spanish priest. It was established as a regular municipality two years later, and a convent was constructed in 1868.
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