Agatho of Rome

Our father among the saints Agatho of Rome was the pope of the Church of Rome from 678 to 681. He was remembered as a man of amiable disposition who got along well with people. His letter, that explained the traditional belief of the Church that in Christ there are two wills, divine and human, was the basis for the condemnation of the Monothelitism at the Sixth Ecumenical Council . His feast day is February 20 .

Source: OrthodoxWiki