By Shaun McAfee, Catholic Exchange - As the Church celebrates the feast of St. Dominic, we are reminded not only of the man—the preacher, the founder, the father of the Order of Preachers—but also of the weapon he wielded in defense of truth: the Holy Rosary. Although its exact origins are in disagreement with some historians, what is beyond dispute is the Rosary’s deep association with Dominic and his mission to confront the great heresies of his time, especially the Cathars, or Albigensians, whose dualistic worldview threatened the foundations of Christian belief.