The convent of San Vítores Monument · Fresno de Río Tirón, Montes de Oca, Burgos The Constable of Castile ordered it raised in 1464 to guard the relics of San Vítores. Dominicans occupied it until the middle of the sixteenth century and afterwards Franciscans, who remained in it until 1825. Photo: Thomas Holbach (CC BY-SA 4.0) What to see and do in Fresno de Río Tirón