Today, on the calendar of the Sarum use of the Roman rite, we celebrate Sts. Dennis, Bishop; Rusticus, Priest; and Eleutherius, Deacon. These bright luminaries of the Church were martyred at Paris in the 1st or 2nd century. St. Dionysius or Dennis of Paris has often been confused with St. Dionysius of Athens ("the Areopagite"), but the Sarum martyrology assigns them distinct days as distinct persons (the Areopagite to Oct. 3, the Parisian martyr Oct. 9).
In the icon below, St. Dennis appears on the right:
Holy Martyrs Dionysius, Rusticus, and Eleutherius, pray to God for us!
Sancti Martyres Dionysi, Rustice, et Eleutheri, ora pro nobis Deum!