The patron saint of Fabro is Saint Martin of Tours, celebrated on 11 November, with the parish church dedicated to him, from the 16th century on a probable early medieval foundation: in the same month the Maratonina di San Martino is run, a 15-kilometre road race.
The oldest place name of Fabro dates from 1118 and is identical to today's; in the Middle Ages the town was called «Castrum Fabri», the castle of Fabro, subject from the Middle Ages onward to the jurisdiction of Orvieto, to which it paid tribute and whose fortunes it shared. In 1300, the year Pope Boniface VIII proclaimed the first Jubilee in history, the town of Orvieto sent its own cavalry to Rome to guard and protect the city and the pope: from Fabro's territory twenty foot soldiers set out, along with others from the nearby castles of Camporsevoli, Ficulle, Monteleone, Montegabbione, Carnaiole and Montegiove.
