Sergius I was Pope of Rome from 687 to 701. Born around 650 to an Antiochene Syrian family that had settled at Panormus (modern Palermo) in Sicily, he came to Rome during the pontificate of Pope Adeodatus II and rose through the Roman clergy, being ordained cardinal-priest of the church of Santa Susanna under Pope Leo II. His pontificate is remembered chiefly for its close ties with the churches of Anglo-Saxon England, for fostering the missions to the Frisians and the peoples of Germany, and for his refusal to ratify the canons of the Quinisext Council, which set him in conflict with the Emperor Justinian II.
Sergius came to the papacy through a disputed election. On the death of Pope Conon in 687, two rival factions put forward the archdeacon Paschal and the archpriest Theodore. The wider body of clergy and people set both candidates aside and chose Sergius, who was consecrated, by the account of the sources, on 15 December 687. He is venerated among the Western pre-schism saints recognized within the Orthodox tradition, and is commemorated on September 8, the day of his repose.
In his dealings with the Christian West, Sergius received and baptized King Caedwalla of the West Saxons at Rome in 689, and he supported the English churchmen Wilfrid and Aldhelm. His most lasting act of missionary patronage was the consecration of the Englishman Willibrord as bishop of the Frisians, whom he sent to preach in Frisia; by tradition the sources also connect him with sending further missionaries into Germany. In the liturgy of Rome he introduced the Agnus Dei into the Mass and instituted processions to the city's churches, and he repaired and adorned a number of its basilicas. He died on September 8, 701, and was succeeded by Pope John VI.