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Abel
Abel was one of Adam and Eve's two sons. His brother, Cain, murdered him out of jealousy in order to acquire the Apple of Eden he obtained.
Abel, being of direct First Civilization descent, was very closely related to them himself, and likely had the sixth sense of Eagle Vision. At one point, he obtained an Apple of Eden and was killed by his older brother out of jealousy of the object. Abel became the first murder victim in recorded history, while Cain was the first recorded murderer.
Cain was subsequently branded with a mark for his deed, which was later adopted by the Templar Order as its insignia.