His cult is attested in the early 5th c. by Prudentius Peristephanon 9, who, traveling from Spain to Rome, tells how he stopped at the Forum Cornelii at the saintâ€™s tomb: on its sides were depicted the events of the martyrdom of Cassian, a teacher of ars notaria who was struck down by his students bearing stilettos the Berna MS, Burgerbibliothek 264, transmits Prudentiusâ€™s poem with numerous illustrations. A Carolinian-era Passio s. Cassiani by Ubaldus of Saint-Amand puts Prudentiusâ€™s account into prose. Cassianâ€™s mention on 13 August in the Martyrologium hieronymianum attests his cult in the 1st half of the 5th c.; at Milan in 451 there was a votive chapel in his honor; at Rome Pope Symmachus 498â€“514 dedicated an altar to him in the Vatican basilica. According to a tradition, Peter Chrysologus, the Imolese bishop of Ravenna 424â€“451, went to Imola to render homage at St. Cassianâ€™s tomb and died there. The tomb became a site of the bishopâ€™s palace and quite famous. The tomb was in use at least from the beginning of the 11th c. until 1132, when the Castrum s. Cassiani was destroyed and the saintâ€™s relics were deposited in the cathedral dedicated to him inside the city. The 12th-c. Vita et gesta Cassiani, Ingenuini et Albini is evidence of St. Cassianâ€™s cult in the Tyrol, at SÃ¤ben and at Brixen.