Cyriacus II of Constantinople was a 6th-century prelate who served as the Ecumenical Patriarch of Constantinople from 596 until 606. Before ascending to this high position, he worked as a presbyter and as the steward of the great church in his home city. His leadership was characterized by a firm adherence to the title of ecumenical bishop, a practice that led to significant theological and political friction with Pope Gregory I, who viewed the claim as a threat to church unity.
Ecclesiastical role
During his tenure, Cyriacus II maintained his use of the ecumenical title despite stern warnings from the Roman papacy. While Pope Gregory I expressed personal respect for him, the Pope also criticized the title as a source of division. Cyriacus II remained steadfast in this claim, even considering a council to formalize the usage. Despite these tensions, he held significant influence, successfully securing a pledge of orthodox faith from Emperor Phocas during his coronation.
Life and death
The patriarch was known for his piety and his efforts to protect the sanctity of the church, notably resisting Emperor Phocas when the ruler attempted to forcibly remove the empress Constantina from her sanctuary. Cyriacus II died in 606 and was buried in the church of the Holy Apostles. He also contributed to the city's religious landscape by constructing a church dedicated to the theotokos in the Diaconissa street.