Title
- Codicillus1
- Collationes de decem praeceptis1
- Collection1
- Commentary on Dante1
- Commentary on Eusebius1
- Commentary on Martial1
- Commentary on Psalms1
- Commentary on Ptolemy1
- Concessions1
- Confessione generale1
- Correspondence1
- Correspondence of Jerome1
- De Universo1
- De adventu Christi1
- De amore et dilectione dei1
- De arte cognoscendi venena1
- De arte metrica1
- De balneis Sancti Cassiani1
- De balneis viterbiensibus1
- De chorographia1