Mexican engineer and rebel officer active at the beginning of the Mexican War of Independence. Mariano Jimenez was born in San Luis Potosi. He studied in the Colegio de Mineria in Mexico City to become a mining engineer. He graduated in 1804. He soon moved to Guanajuato, where he was able to follow the progress of the conspiracy led by Miguel Hidalgo that aimed to achieve the independence of Mexico from Spain. A few days after the war started, Jimenez joined Hidalgo's army and was able to rise quickly in rank until he achieved the rank of lieutenant colonel.