Pope Adeodatus II, the seventy-seventh head of the Church, led the Holy See from 672 to 676, staunchly opposing Monothelitism and advocating for monastic reform. He preserved the memory of the martyred Pope Martin I and prioritized the well-being of the poor, encouraging compassion and generosity among the clergy.

Pope Adeodatus II was the seventy-seventh head of the Church. He led the Holy Church from 11 April AD672 to 17 June AD676. Very little is known about his life and reign. When he was elected the Pontiff, he was an elderly monk at the Benedictine monastery of St. Erasmus on the famous Caelian Hill in Rome.

Pope Adeodatus II played a major role in preserving the memory of Saint Martin I, who was brutally tortured and martyred by Emperor Constans II.

Like his predecessors, he fought vigorously against the heresy of Monothelitism and took every precaution to prevent the Church from falling into that heresy. When the newly elected Patriarch of Constantinople, Constantine I, sent the Pope letters containing the decisions of the Synod convened in Constantinople under his leadership and his declaration of faith, the Pope was unwilling to accept them. The reason given by Pope Adeodatus was that the new Patriarch of Constantinople, like his predecessors, followed Monothelite teachings.

Pope Adeodatus II took the initiative in monastic reform and the growth of the Church. He devoted all his time and attention to the spiritual advancement of the Church. He paid special attention to the well-being of the poor and exhorted and encouraged the Church and its clergy to show compassion and generosity towards them.

On 17 June AD676, Pope Adeodatus II passed away. He was laid to eternal rest in St. Peter's Basilica.