Rex Calabrese was a gangster who used to run the Mob in Gotham City, his power was so immense he became known as the Lion. Operating around the mid twentieth century, Calabrese believed in something he referred to as the Natural Order. He believed that one day, much like he had done to the previous Mob boss, a new up and coming gangster would depose of him and kill him. This self-made prophecy was self fulfilling as Calabrese was killed and his empire taken over by Carmine Falcone.

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