Clement of Alexandria Stromata Book I

And to prove that this is true, it is written in the Gospel by Luke as follows: "And in the fifteenth year, in the reign of Tiberius Caesar, the word of the Lord came to John, the son of Zacharias." And again in the same book: "And Jesus was coming to His baptism, being about thirty years old,"[292]

Tertullian Against Marcion Book IV

In the fifteenth year of the reign of Tiberius[155]

Five Books in Reply to Marcion

115 Came suddenly to earth,[14]

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Old Testament