Pius I Biography and Timeline

Pope

Appointed Pope

Role range: 0140-0154

Aquileian Origin

Later papal tradition identifies Pius I as a native of Aquileia in northern Italy.

Role range: 0142-0161

Beginning of Pontificate

Vatican chronology places the beginning of Pius I's pontificate in either 142 or 146, reflecting uncertainty in the early episcopal dating.

Role range: 0142-0161

Succession after Hyginus

Early episcopal lists place Pius I after Hyginus in the succession of bishops of Rome.

Role range: 0142-0161

Marcion Excluded from Communion

Early Christian tradition records that Marcion was excluded from communion with the Roman church during the episcopate of Pius I.

Role range: 0142-0161

Marcionite Break

Marcion organized a separate Christian community in Rome after his break with the Roman church during Pius I's episcopate.

Role range: 0142-0161

Cerdon Active in Rome

The teacher Cerdon was active in Rome during the period traditionally assigned to Pius I's episcopate.

Role range: 0142-0161

Valentinus Active in Rome

The Gnostic teacher Valentinus remained active in Rome during the episcopate of Pius I.

Role range: 0142-0161

Baptistry Tradition

Later accounts attributed to Pius I the establishment of a baptistry near Santa Pudenziana, although modern scholarship treats the story cautiously.

Role range: 0142-0161

Hermas Family Connection

Ancient sources identify Hermas, author of The Shepherd, as a brother of Pius I.

Role range: 0142-0161

Jewish Convert Baptism Tradition

The Liber Pontificalis later attributed to Pius I a ruling that Jewish converts to Christianity should be admitted to baptism.

Role range: 0142-0161

Justin Martyr Teaching

Justin Martyr taught Christian doctrine in Rome during the episcopate of Pius I.

Role range: 0142-0161

Roman Christian Intellectual Activity

The Roman Christian community during Pius I's episcopate hosted competing teachers including Justin, Valentinus, Cerdon and Marcion.

Role range: 0142-0161

Santa Prassede Tradition

Later legend also associated Pius I with the Christian community remembered at Santa Prassede, but the tradition is not securely historical.

Role range: 0142-0161

Santa Pudenziana Tradition

A later tradition connected Pius I with the early Christian community associated with Santa Pudenziana, although the historical basis is uncertain.

Role range: 0142-0161

Shepherd of Hermas

The Muratorian Fragment later stated that Hermas wrote The Shepherd in Rome while his brother Pius occupied the Roman episcopal chair.

Role range: 0142-0161

Traditional Pontificate

Some traditional chronologies place the end of Pius I's episcopate around 154 or 155, while Vatican chronology allows later dates.

Role range: 0142-0161

Muratorian Fragment Testimony

The Muratorian Fragment remembered Pius I as bishop of Rome and identified the author Hermas as his brother.

Irenaean Succession List

Irenaeus recorded the Roman episcopal succession as Hyginus, Pius and Anicetus, providing an early witness to Pius I's place in the sequence.

Liberian Catalogue Tradition

The Liberian Catalogue preserved Pius I in the Roman episcopal succession and repeated the association between Pius and Hermas.

Martyrdom Status Reassessment

The 1969 revision of the Roman calendar concluded that there were no sufficient grounds for presenting Pius I as a martyr.