Who was the Christian bishop who argued that the "City of God" was represented by the universal Catholic Church?

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Augustine of Hippo is known for his work "City of God," in which he contrasts the earthly city with the heavenly city, the latter represented by the universal Catholic Church. This work was a response to the sack of Rome and aimed to shift the focus from earthly to spiritual realms.

Who Was the Christian Bishop Who Argued That the "City