It was led by Pei Shan-wei, who opposed Eric Langhorne's plan to wipe out the Adams and Eves's original memories. In order to keep her and her followers from spoiling his plans to establish himself as a God-like figure on Safehold, Langhorne had the Alexandria Enclave destroyed by an orbiting bombardment platform.
The Enclave and its surrounding area were completely devastated by the bombardment, with only the inhabitants of one minor settlement surviving to tell the story of the destruction. The area, which was avoided by Safeholdians as a cursed place, was from then on known as Armageddon Reef. (OAR)