Lady Catrina was a noble of the House of Tregor and friend of Gaius. As a child, she was treated by him because she had an incurable bone disease that made it difficult for her to walk. Apparently she met the Pendragon family at some point during her life.

Later a female troll assumed her appearance and managed to enter Camelot's court and became Queen of Camelot by placing Uther under a spell. It was said that the real Lady Catrina was the last survivor of the House of Tregor. The troll stole the badge of her family to enter Camelot, but didn't know about her bone disease. This was a fatal mistake for the troll, as her deception was uncovered by Gaius and Merlin before she was finally killed by Arthur. It is unknown whether the real Lady Catrina is still alive and living somewhere else, or if she passed away at some point. According to Gaius, Catrina was a kind and gracious woman.


Series 2 Enemies
The Curse of Cornelius Sigan: Cedric † • Cornelius Sigan † • Living Gargoyles
The Once and Future Queen: King OdinMyror
The Nightmare Begins: SerketsUther Pendragon
Lancelot and Guinevere: KendrickHengistWilddeoren
Beauty and the Beast: Troll † • Lady Catrina (indirect) † • JonasUther Pendragon (indirect) †
The Witchfinder: AredianUther Pendragon
The Sins of the Father: Morgause † • King OdinUther Pendragon
The Lady of the Lake: HaligFreya (indirect) †
Sweet Dreams: King AlinedTricklerLady Vivian (indirect) • King Olaf
The Witch's Quickening: AlvarrMorgana † • Mordred † • EnmyriaKilgharrah
The Fires of Idirsholas: Morgause † • Morgana † • Knights of MedhirKilgharrah
The Last Dragonlord: KilgharrahAsgerd
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