In 1716, The Spanish Council of War approved a site on the San Antonio River for construction of a fort. The Domingo Ramón expedition, accompanied by the trader St. Denis from Louisiana (who had come to the site two years previous) established a presidio on the river. That council also approved a request by Father Olivares to establish a Catholic mission at the site.
In 1718, Martin de Alarcón, then Governor of Texas, reinforced the presidio and the ten soldiers and their families were recognized officially as the beginning of the villa. Alarcón named the presidio San Antonio de Béjar in honor of the Duke of Béjar, in Spain, the viceroy's brother, who died what was considered a hero's death defending Budapest from the Ottoman Empire in 1686.