(Canto 1, line 134)
"The portal of Saint Peter" has two explanations: the gate of Purgatory and the gate of heaven. Most commentators incline towards the former, because Cantos 9 and 21 of "Purgatory" both describe the gate to Purgatory as guarded by an angel, a vicar of Peter. Also, as pointed out by Reggio, Paradise as described by Dante does not even have a gate. Sapegno disagrees, saying it would be more natural for Dante to have the final destination of the journey in mind.