American Horror Story: Roanoke adapted Celtic mythology to create an origin story for the first Supreme in the anthology's continually connected lore.
The series sixth season premiered in 2016 and followed Hotel, which was a distinct change of pace for the series as it was the first without mainstay leading lady, Murder House and Asylum.
Gaga returned to Roanoke as a minor character, comparatively, but played an interesting role all the same. Her character, Scáthach, was very different in the series than its origins, which are rooted in Celtic mythology.
American Story: Roanoke - Scathach's Origin Explained
the show's third season, Coven.
The real origin of Scáthach is based in Celtic/Gaelic mythology, specifically the Ulster cycle. According to lore, Scáthach wasn't a witch at all; instead, she was an infamous warrior who was linked to Amazons. She was primarily noted as a teacher of warriors, and even was responsible for the training of famed Celtic warrior, Cú Chulainn, who is considered by some to be the incarnation of Irish God, Lugh. Her name means "shadowy one" or, quite literally, "warrior maid." Instead of being a scorned woman who has endured betrayal and hardship, as was covered in the character's backstory in Roanoke, Scáthach is more of a noble, respected figure in her existing lore. Her combat skills include pole vaulting, underwater fighting, and adept use of a barbed, harpoon-like weapon she created herself, which is known as a gáe bolg.
Scáthach is also associated with the Isle of Skye in Scotland. While sometimes in very inaccurate ways - it seems that, for the purpose of American Horror Story: Roanoke, Scáthach was more of a loose translation than a direct adaptation of the myth.
