Chapters (12)
| AELLE | A Saxon King |
| AGRICOLA | Warlord of Gwent |
| AMHAR | Bastard son of Arthur, twin to Loholt |
| ARGANTE | Princess of Demetia, daughter of Oengus mac Airem |
| ARTHUR | Bastard son of Uther, warlord of Dumnonia, later Governor of Siluria |
| ARTHUR-BACH | Arthur’s grandchild, son of Gwydre and Morwenna |
| BALIG | Boatman, brother-in-law to Derfel |
| BALIN | One of Arthur’s warriors |
| BALISE | Once a Druid of Dumnonia |
| BORS | Lancelot’s champion and cousin |
| BROCHVAEL | King of Powys after Arthur’s time |
| BUDIC | King of Broceliande, married to Arthur’s sister Anna |
| BYRTHIG | King of Gwynedd |
| CADDWG | Boatman and sometime servant of Merlin |
| CEINWYN | Sister of Cuneglas, Derfel’s partner |
| CERDIC | A Saxon King |
| CILDYDD | Magistrate of Aquae Sulis |
| CLOVIS | King of the Franks |
| CULHWCH | Arthur’s cousin, a warrior |
| CUNEGLAS | King of Powys |
| CYWWYLLOG | One-time lover of Mordred, servant to Merlin |
| DAFYDD DERFEL | The clerk who translates Derfel’s story (pronounced Dervel) The narrator, one of Arthur’s warriors, later a monk |
| DIWRNACH | King of Lleyn |
| EACHERN | One of Derfel’s spearmen |
| EINION | Son of Culhwch |
| EMRYS | Bishop of Durnovaria, later Bishop of Silurian Isca |
| ERCE | A Saxon, Derfel’s mother |
| FERGAL | Argante’s Druid |
| GALAHAD | Half-brother to Lancelot, one of Arthur’s warriors |
| GAWAIN | Prince of Broceliande, son of King Budic |
| GUINEVERE | Arthur’s wife |
| GWYDRE | Arthur and Guinevere’s son |
| HYGWYDD | Arthur’s servant |
| IGRAINE | Queen of Powys after Arthur’s time. Married to Brochvael |
| ISSA | Derfel’s second-in-command |
| LANCELOT | Exiled King of Benoic, now allied to Cerdic |
| LANVAL | One of Arthur’s warriors |
| LIOFA | Cerdic’s champion |
| LLADARN | Bishop in Gwent |
| LOHOLT | Bastard son of Arthur, twin to Amhar |
| MARDOC | Son of Mordred and Cywyllog |
| MERLIN | Druid of Dumnonia |
| MEURIG | King of Gwent, son of Tewdric |
| MORDRED | King of Dumnonia |
| MORFANS | ‘The Ugly’, one of Arthur’s warriors |
| MORGAN | Arthur’s sister, married to Sansum |
| MORWENNA | Derfel and Ceinwyn’s daughter, married to Gwydre |
| NIALL | Commander of Argante’s Blackshield guard |
| NIMUE | Merlin’s priestess |
| OENGUS MAC AIREM | King of Demetia, leader of the Blackshields |
| OLWEN THE SILVER | Follower of Merlin and Nimue |
| PERDDEL | Cuneglas’s son, later King of Powys |
| PEREDUR | Lancelot’s son |
| PYRLIG | Derfel’s bard |
| SAGRAMOR | Commander of one of Arthur’s warbands |
| SANSUM | Bishop of Durnovaria, later Bishop at Dinnewrac monastery |
| SCARACH | Issa’s wife |
| SEREN (1) | Derfel and Ceinwyn’s daughter |
| SEREN (2) | Daughter of Gwydre and Morwenna, Arthur’s granddaughter |
| TALIESIN | ‘Shining Brow’, a famous bard |
| TEWDRIC | Once King of Gwent, now a Christian hermit |
| TUDWAL | Monk at Dinnewrac monastery |
| UTHER | Once King of Dumnonia, Mordred’s grandfather, Arthur’s father |
Places
Names marked* are fictional