High Quality Content by WIKIPEDIA articles! María Estela Martínez Cartas de Perón (born February 4, 1931), better known as Isabel Martínez de Perón or Isabel Perón, is a former President of Argentina. She was also the third wife of another former President, Juan Perón. During her husband's third term as president, Isabel served as vice president and following her husband's death in office, Isabel served as president from July 1, 1974 to March 24, 1976. She was the first non-royal female head of state and head of government in the Western Hemisphere.