The former treatise have I made, O Theophilus, of all that Jesus began both to do and teach,
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Theophylact of Ochrid
AD 1107
O Theophilus: He writes to Theophilus, a man probably of some distinction, and a governor; for the form, "Most excellent" Lk 1:3, was not used except to rulers and governors. As for example, Paul says to Festus, Most excellent Festus.