Since the Vatican was a part of Rome, the practice of the death penalty was spread on it both during the Inquisition, and in the period of its decline. Like everywhere in Italy, the death penalty was executed by secular authorities, and used to be approved by the Holy See since its inception. There are many works of religious leaders, starting with Aurelius Augustine "The City of God" (written in 413-427), that approved of the imposition and execution of death sentences by secular authorities.