To all that be in Rome, beloved of God, called to be saints: Grace to you and peace from God our Father, and the Lord Jesus Christ.
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Tertullian of Carthage
AD 220
I will not speak of gods at all, nor of lords, but I shall follow the apostle, so that if the Father and the Son are both to be invoked, I shall call the Father “God” and invoke Jesus Christ as “Lord.”