The Alamo Mission in San Antonio, commonly known simply "The Alamo", was originally known as the Mission San Antonio de Valero. It is a former Roman Catholic mission and fortress compound and the site of the Battle of the Alamo in 1836. It is now a museum in the Alamo Plaza District of Downtown San Antonio, Texas, USA. Built by the Spanish Franciscan priest, Antonio de Olivares, and Payaya Indians, it forms the genesis of the present city of San Antonio, Texas, along with the Presidio San Antonio de Bexar and the Acequia Madre de Valero.