Roman Martyrology-October 17th- on this date in various years-
At Paray, in the diocese of Autun, St. Margaret Mary Alacoque. She made her profession in the Order of the Visitation of Blessed Mary the Virgin, and she excelled with great merit in spreading devotion to the Most Sacred Heart of Jesus and in furthering its public veneration. Pope Benedict XV added her name to the list of holy virgins.
At Antioch, the birthday of St. Heron, a disciple of blessed Ignatius. Being made bishop after him, he religiously followed his master’s footsteps, and, as a true lover of Christ, died for the flock entrusted to his keeping.
The same day, the martyrdom of the Saints Victor, Alexander, and Marian.
In Persia, St. Mamelta, martyr. He was converted from idolatry to the faith by the warning of an angel, and was later stoned by heathens and cast into a deep lake.
At Orange in France, St. Florentinus, bishop, who died leaving a reputation for many virtues.
And elsewhere in divers places, many other holy martyrs, confessors, and holy virgins.
R. Thanks be to God.