Adam Clarke on Acts 25:26

I have no certain thing to write - Nothing alleged against him has been substantiated.

Unto my Lord - The title Κυριος, Dominus, Lord, both Augustus and Tiberius had absolutely refused; and forbade, even by public edicts, the application of it to themselves. Tiberius himself was accustomed to say that he was lord only of his slaves, emperor or general of the troops, and prince of the senate. See Suetonius, in his life of this prince. The succeeding emperors were not so modest; they affected the title. Nero, the then emperor, would have it; and Pliny the younger is continually giving it to Trajan in his letters.