Ignacio Gregorio Comonfort de los Ríos (12 March 1812 – 13 November 1863) was a Mexican politician and military officer who served as President of Mexico.

He was born in 1812 in Puebla de los Ángeles, in the state of Puebla, to French parents. He participated in the Mexican-American War. He was president of Mexico from 11 December 1855 to 21 January 1858. During his term as president, Benito Juárez served as president of the Supreme Court of Mexico.

During Comonfort's administration, the country descended into the War of the Reform, a civil war launched by reactionaries against the Constitution of 1857 which, among other things, had abolished privileges for the Catholic Church.

Shortly after the adoption of the Constitution of 1857, a board of generals staged a coup d'état, proclaiming the Plan of Tacubaya, which decreed the nullification of the Constitution. President Comonfort, representing himself as a moderate, wavered but decided to go along with the generals. In exchange, the Catholic Church repealed the March 1857 excommunication decree for those who adhered to the new plan.

Comonfort is a Mexican city (and municipality) located in the state of Guanajuato. The municipality has an area of 485.90 square kilometres (1.60% of the surface of the state) and is bordered to the north and northeast by San Miguel de Allende, to the east by the state of Querétaro, to the south and southwest by Empalme Escobedo, Apaseo el Grande, Celaya and Santa Cruz de Juventino Rosas, respectively . The municipality had a population of 67,642 inhabitants according to the 2005 census..

In pre-Columbian times the area of what is today Comomfort was known as Chamacuero, a word of Tarascan origen that means "To fall down" or "Place of ruins."

Coordinates: 20°43′N 100°46′W / 20.717°N 100.767°W / 20.717; -100.767

Melchor Ocampo (5 January 1814, Maravatío, Michoacán – 3 June 1861, Tepeji del Río, Hidalgo) was a Mexican lawyer, scientist, and liberal politician.

His home state was renamed Michoacán de Ocampo in his honour.

Ocampo studied at the Roman Catholic seminary in Morelia, Michoacán, and later law at the Colegio Seminario de México (Universidad Pontificia). He began working in a law office in 1833 and travelled to France in 1840, where he was influenced by liberal and anticlerical ideas of the Enlightenment. He later returned to Michoacán to work his family's lands, practice law, investigate the region's flora and fauna, and study the local indigenous languages.

He was elected to the Chamber of Deputies in 1842. He served as Governor of Michoacán during the U.S. Invasion, and as Treasury Minister in 1850. Because of one of his more controversial projects, he was forced to flee the country by President Antonio López de Santa Anna, taking refuge first in Cuba and then in the U.S. city of New Orleans. In New Orleans he met a group of liberals, including Benito Juárez, and began to publish pamphlets to promote political change in Mexico. The result of his efforts was the Plan de Ayutla of 1855, which called for the overthrow of Santa Anna and the installation of the liberal general Juan Álvarez. With Álvarez's victory, Ocampo served briefly in his cabinet as foreign minister.