| Role | Name | Name (original language) | Name (translation) | Floruits |
|---|---|---|---|---|
| Addressor | Innocent III, pope (d.1216) | Innocentius | Innocent, bishop, servant of servants of God | 1198 × 1216 |
| Addressee | Bjarni Kolbeinsson, bishop of Orkney | Orchadensi episcopo | bishop of Orkney | 1198 × 1202 |
| Bearer of letters | Lumberd, a layman | Lumberdus | Lumberd, layman | 1202 × 1202 |
| named person (transaction) | Harald Maddadson, earl of Orkney and Caithness (d.1206) | comite suo Catenesiam | his earl [of Caithness] | 1151 × 1196 |
| named person (transaction) | John, bishop of Caithness (fl.1185×89-1202) | episcopus Catenesie | bishop of Caithness | 1189 × 1196 |