Thank you! If you read further about Pope Vigilius, you will see he is the one of whom I spoke. He went to Rome with Theodora's blessing for the express purpose of supporting the monophysites and then, once in place as the Vicar of Christ, did not commit heresy.
He is a classic example of a papal succession full of intrigue and human frailty that did not compromise the faith--even when that was the purpose.
Somewhat like St. Thomas Becket, who when he finally had the chance to do the King's bidding, did the Lord's instead. It does happen, and one has to hope that the graces of consecration will be stronger than any other allegiances the individual may have made.
Thanks to you both!