Caste War of Yucatán
Yucatán declared its independence from the Spanish Crown in 1821 and in 1825, the area was assigned to the Valladolid region. During the Caste War of Yucatán Manuel Antonio Ay, a local chieftain, was one of the main promoters of the rebellion by the indigenous people against the government. It was designated as its own municipality in 1875.