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The only daughter of an English steelworks manager based in the Rhondda Valley of southern Wales, and a Welsh mother, Cecily went on to marry Ethan Frye and subsequently joined the Assassin Brotherhood. In time, they also acted as the superiors of the Assassin George Westhouse, whom they trained and ran missions with.
On the 9th of November 1847, Cecily gave birth to Jacob and Evie, but died of complications shortly thereafter. Depressed and in mourning, Cecily's husband, Ethan, traveled to India for sometime after accepting an offer from Cecily's mother to raise Jacob and Evie until the age of six.