The interpretation timeline
Acts 25:12 Douay-Rheims

Then Festus having conferred with the council, answered: Hast thou appealed to Caesar? To Caesar shalt thou go.

A.D. 407 – 1871 4 witnesses

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“"Then Festus, when he had conferred with the council" - do you observe how he seeks to gratify them? for this is favor - "having conferred," it says, "with the council, he said, Hast thou appealed unto Caesar? unto Caesar shall thou go." See how his trial is again lengthened out, and how the plot against him becomes an occasion for the preaching: so that with ease and in safe custody he should be taken away to Rome, with none to plot evil against him: for it was not the same thing his simply coming there, and his coming on such a cause. For, in fact this was what made the Jews come together there. Then again, some time passes while he tarries at Jerusalem, that you may learn, that, though some time passed, the evil design against him prevails nothing, God not permitting it. But this king Agrippa, who was also a Herod, was a different Agrippa, after him of James' time, so that this is the fourth Herod. See how his enemies cooperate with him against their will. To make the audience large, Agrippa falls into a desire of hearing: and he does not simply hear, but with much parade.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Then Festus, when he had conferred with the council,.... Not with the Jewish sanhedrim, or any part of it that came down on this occasion; but with Roman counsellors, which he had to assist him in judgment, when any difficult matters were before him; the Syriac and Ethiopic versions render it, "with his counsellors"; and the Arabic reads in the singular number, "with his counsellor"; with these he advised, whether it was proper to admit of Paul's appeal, or not; and having had their opinion, he answered, hast thou appealed unto Caesar? unto Caesar shalt thou go: the question is put, partly for the more certain knowledge of the thing, that there might be no mistake in it; and partly on account of the Jews, that they might see that though he was disposed to do them a favour, it was not in his power, because of this appeal; and it may be with some resentment in himself, since it carried in it a sort of reflection upon him, as if he was incapable of issuing this affair, or would not be just and faithful in it.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Conferred with the council - From this circumstance, we may learn that the appeal of Paul to Caesar was conditional; else Festus could not have deliberated with his council whether it should be granted; for he had no power to refuse to admit such an appeal. We may, therefore, understand Paul thus: "I now stand before a tribunal where I ought to be judged; if thou refuse to hear and try this cause, rather than go to Jerusalem, I appeal to Caesar." Festus, therefore, consulted with the council, whether he should proceed to try the cause, or send Paul to Rome; and it appears that the majority were of opinion that he should be sent to Caesar. Hast thou appealed unto Caesar, etc. - Rather, Thou hast appealed unto Caesar, and to Caesar thou shalt go. The Jews were disappointed of their hope; and Festus got his hand creditably drawn out of a business with which he was likely to have been greatly embarrassed.”
Source
1871
A.D.
1871
“Festus--little expecting such an appeal, but bound to respect it. having conferred with the council--his assessors in judgment, as to the admissibility of the appeal. said, Hast thou--for "thou hast." to CÃ&brvbrsar shalt thou go--as if he would add perhaps "and see if thou fare better."”
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.