Matamoros, Mariano (märyäˈnō mätämōˈrōs) [key], d. 1814, Mexican revolutionist in the war against Spain. He was, like Miguel Hidalgo y Costilla and José María Morelos y Pavón, a priest with liberal political opinions. Much harassed by the Spanish authorities after the outbreak of the revolution of 1810, he joined Morelos (1811) and became a prominent military leader. After the defeat of Morelos's army by Agustín de Iturbide, Matamoros was captured, demoted from priestly office, and shot.
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