Usually Orthodox and Protestants as well, use what happened in the Fifth Ecumenical Council as an evidence against Rome’s supremacy. I quote to you what happened in this council
A controversy arose out of the writings known as Three Chapters – written by bishops Theodore, Theodoret, and Ibas. Pope Vigilius opposed the condemnation of the Three Chapters. At the Fifth Ecumenical Council (553) the assembled bishops condemned and anathematized Three Chapters. After the council threatened to excommunicate him and remove him from office, Vigilius changed his mind – blaming the devil for misleading him. Bossuet wrote
"These things prove, that in a matter of the utmost importance, disturbing the whole Church, and seeming to belong to the Faith, the decress of sacred council prevail over the decrees of Pontiffs, and the letter of Ibas, though defended by a judgment of the Roman Pontiff could nevertheless be proscribed as heretical."
German theologian Karl Josef von Hefele notes that the council was called " …without the assent of the Pope"
I think what happened is some sort of a conspiracy against the Pope. also the Emperor was involved in this issue and the Pope clearly wasn’t in his side, so the Emperor did all what he could to make his own wish come true, even if that means breaking the rules.
What do you think of such event that usually used as an evidence against Rome ?