Final answer:
Agustín de Iturbide was known for proclaiming Mexican independence and becoming the first Emperor of Mexico.
Step-by-step explanation:
Agustín de Iturbide was known for proclaiming Mexican independence and becoming the first Emperor of Mexico. In 1821, Iturbide entered Mexico City as the leader of the Army of the Three Guarantees and with the support of Vicente Guerrero and Guadalupe Victoria, he declared independence from Spain. Mexico became a constitutional monarchy, but Iturbide's reign was brief and he abdicated in 1823, leading to the establishment of a republic.