The debate on angels in the thirteenth century : issues relevant to Dante's Divina commedia. Angelic mediation and the ideological context of Dante's angelology ; The debate on angelology : between theology and philosophy ; Two issues in the angelology of the thirteenth century : Dante's original approach ; Conclusions -- Dante and Christian angelology : limits and influence of the pseudo-Dionysian tradition. The interaction of Biblical and pseudo-Dionysian traditions in the cosmological context of the Divina commedia ; The intellectual life ; The angelic hierarchy ; Conclusion -- Moving the stars : angels and the order of the cosmos. Cosmology and angelology ; Astrological determinism and free will ; Conclusions -- Other angelic operations : angels in Purgatorio, the heavenly messenger, and Beatric. The angels and the blessed : a premise ; The role of angels in Purgatorio : beatitudes and the gifts of the Holy Spirit ; The heavenly messenger (Inferno, IX, 79-103) ; Beatrice's angelic light ; Conclusions.