Mateo Romero (c. 1575 –1647) was a Belgian-born Spanish composer of Baroque music and master of the royal chapel. Romero was born as Mathieu Rosmarin in Liège, Belgium, and, following the early death of his father was, like many children from the then Spanish Netherlands, recruited as a child to serve as choir boy at the Madrid court. Between 1586 and 1593 he was taught in Spain by his countrymen George de la Hèle and Philippe Rogier. He took the name Romero in 1594. In 1598 he was maestro de capilla at the Spanish court of Philip II of Spain and Philip III of Spain.

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