Juan Álvarez (hwän äl´värās), 1780–1867, Mexican general of indigenous descent, president of Mexico (1855). He distinguished himself in battle under Morelos y Pavón and was later the first governor of Guerrero. In 1854 he led the liberal Revolution of Ayutla, which overthrew (1855) General Santa Anna. After two months he yielded the presidency to Ignacio Comonfort. Álvarez later fought against Maximilian and the French invaders.