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Anton Orsati was a don on the island of Corsica. He once killed another don over an argument about failure to pay for the labor of the Signadora's husband. He employed the Christopher Keller and others as assassins. His band of professionals was considered to be reliable. They killed on contract for the very rich.
Orsati sent Keller to kill a man. When the Englishman returned to Corsica, Orsati had other missions for him. Eventually, Keller failed to complete one of the missions and confessed his failure to Orsati. After Keller explained, Orsati offered to help him kill a worse villain.
Christopher Keller returns to Corsica to find a man who calls himself the scorpion. He asks Orsati for help to find him. When the don gained knowledge of the man working for ISIS he said that he would help Keller for free.