Pope Leo II confirmed the Council of Constantinople III (A.D. 681), by which the Council became Ecumenical, and in this confirmation includes a statement about the Roman See as well as the condemnation of Honorius:
“My predecessor, Pope Agatho of Apostolic memory, together with his honorable Synod, preached this norm of the right apostolic tradition. This he sent by letter to your piety by his own legates, demonstrating it and confirming it by the usage of the holy and approved teachers of the Church. And now the holy and great Synod, celebrated by the favor of God and your own has accepted it and embraced it in all things with us, as recognizing in it the pure teaching of the blessed Peter, the prince of the Apostles, and discovering in it the marks of sound piety. Therefore the holy and universal sixth synod, which by the will of God your clemency summoned and presided, has followed in all things the teaching of the Apostles and approved Fathers. And because, as we have said, it has perfectly preached the definition of the true faith which the Apostolic See of blessed Peter the Apostle (whose office we unworthily hold) also reverently receives, therefore we, and by our ministry this reverend Apostolic See, wholly and with full agreement do consent to the definitions made by it, and by the authority of blessed Peter do confirm them, even as we have received firmness from the Lord Himself upon the firm rock which is Christ…”
St. Leo goes on to speak of the heretics condemned at the synod:
“And in like manner we anathematize the inventors of the new error, that is, Theodore, Bishop of Pharan, Sergius, Pyrrhus, Paul and Peter, betrayers rather than leaders of the Church of Constantinople, and also Honorius, who did not attempt to sanctify this Apostolic Church with the teaching of Apostolic tradition, but by profane treachery permitted its purity to be polluted”
This condemnation of Pope Honorius was recited at the 7th Ecumenical Council of Nicaea (787) and Constantinople IV (869), as well as by the oath taken upon entering Papal office by all the Pontiffs throughout the 8th to the 11th centuries. That said, Pope Leo II also recognizes the truth of Pope St. Agatho’s letter which contained clear and explicit statements of Papal infallibility and the inability of the Roman Church to err in faith due to the promise of Jesus Christ in blessed Peter.
The Condemnation of Pope Honorius, John Chapman, Paragraph 24