St. John of San Facundus was born at San Fucundus in Spain, and belonged to the Augustinian Order. He was distinguished for his devotion during holy Mass; he loved peace-making and brought an end to a civil war among the factions in Salamanca. He died June 11, 1470. (Adapted from The New Roman Missal by Father Lasance).

(Source: The New Roman Missal by Father Lasance).