Pope Sergius I (c. 650 – 8 September 701) was the bishop of Rome from 15 December 687 to his death, and is revered as a saint by the Roman Catholic Church.

[1] Pope Leo II ordained him cardinal-priest of Santa Susanna on 27 June 683, and he rose through the ranks of the clergy.

[3][5] Though pretending to accept Sergius, Paschal sent messengers to Platyn, promising a large sum of gold in exchange for military support.

[3] He founded the diaconia of Santa Maria in Via Lata on Via del Corso, encompassing a city quarter that developed in the 8th century.

Ekonomou excludes the anathemising of Pope Honorius I, the declaration of Constantinople as equal in privileges but second in honour to Rome.

[11] All popes since Leo the Great had adamantly rejected the 28th canon of the Council of Chalcedon, which on the basis of political considerations tried to raise the ecclesiastical status of the Patriarchate of Constantinople to equality with that of old Rome.

[11] Many of the regulations that the Quinisext Council enacted were aimed at making uniform the existing church practices regarding ritual observance and clerical discipline.

Being held under Byzantine auspices, with an exclusively Eastern clergy, the council regarded the customs of the Church of Constantinople as the orthodox practice.

[4] Eventually, Justinian ordered Sergius's arrest and abduction to Constantinople by his notoriously violent bodyguard protospatharios Zacharias.