Title
- Office of the Dead1
- Officium dicendum in ecclesiola supra illos, qui damnati sunt ad mortem1
- Omnes ad praeda venient1
- On buying and selling1
- Opusculum de formandis epistolis1
- Orations1
- Ordinal1
- Ordinances1
- Ordinatio totius officii divini1
- Ordo judicarius1
- Organon1
- Orthographia1
- Ouidius de remediis amoris1
- Panegyric1
- Pantheon1
- Papal agreement1
- Papal diaries1
- Papal letter1
- Partial Chronicon pontificum et imperatorum with continuations and list of bishoprics1
- Partial copy of Chronicon1