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This relief is one of the seven 'discoverers of the crafts' in the lower register of the socle of the Campanile, of which four are on the west side.
Jabal was the son of Lamech and Ada, and he was the brother of Jubal and half-brother of Tubalcain. He is mentioned in Genesis 4:20: "And Ada brought forth Jabel; who was the father of such as dwell in tents, and of herdsmen."
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