Roisin Ni Mheara

She was English, and an English traitor at that. Her real name was Phyllis James, although she went by many pseudonyms over the years: Rosaleen James, Nora O’Mara, Rosaleen O’Mara, before settling on the final incarnation, Róisín Ni Mhéara (or Róisín Ni Mhéara-Vinard). By trial and error, and with deliberate intent, she morphed from an abandoned English infant to fully Gaelicised, ethnic Irishwoman during a decades-long strategic campaign to become something she was certainly not—Irish. [History Ireland]