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| Also Known As: | Court Physician |
| Race: | Warlock
Human |
| Gender: | Male |
| Family: | Alice (ex-fiancee) Gaius's Mother (mother) † Astonever (first wife) † Danbraver (daughter) Custebron (older brother) † |
| Affiliation: | Merlin Alice Geoffrey of Monmouth Arthur Pendragon † Guinevere Pendragon Morgana Pendragon (formerly) † Hunith Balinor † Uther Pendragon † Knights of Camelot Old Merlin (disguise) Kilgharrah The Knights of the Round Table |
| Enemies: | Edwin Muirden † Morgana Pendragon † Nimueh † Morgause † Aredian † Agravaine de Bois † Alator (formerly) † Lamia † Lancelot (Shade) † Goblin Manticore † Grunhilda † |
| Portrayer: | Richard Wilson |
| List of Appearances: | All episodes to date |
- "The heart of old Camelot."
- ―Agravaine, on Gaius[src]
GaiusGaius is aged around 72 in Series 3 as he stated in 'Love in the Time of Dragons that a book was given to him by Alice. The incription inside the book states it was given to him on his 50th birthday, by Alice, before the Great Purge, which was 22 years earlier. He is still alive in Series 5, which takes place three years after series 4, making him 77 years old. is the Court Physician of Camelot and has been for the last twenty-seven to twenty-nine years, since the birth of Arthur Pendragon. Additionally, he has a great knowledge of sorcery and the legends associated with it, having studied and practised it for many years before the Great Purge. He is Merlin’s mentor and friend, and one of the few people who know of his magical abilities.