San Marcello al Corso is a titular church whose cardinal-protector normally holds the rank of cardinal-priest. The church, dedicated to Pope Marcellus I, is located just inset from Via del Corso and which now connects Piazza Venezia to Piazza del Popolo. It stands diagonal from the church of Santa Maria in Via Lata and 2 doors from theOratory of Santissimo Crocifisso. While the tradition holds that the church was built over the prison of Pope Marcellus I (d. 309), it is known that the Titulus Marcelli was present no later then 418, when Pope Boniface I was elected there. The "Septiformis" litany, commanded by Pope Gregory I in 590, saw the men moving from San Marcello.