Sextus Claudius Petronius Probus

He had a successful political career, becoming praefectus urbanus, Proconsul of Africa, four times praetorian prefect, and consul alongside the emperor Gratian.

According to the family tree published by Mommaerts and Kelley, Probus was a son of Petronius Probinus, consul in 341, and "Claudia"/"Clodia", a sister of Clodius Celsinus Adelphius.

His date of death is unknown, though he was still living in 390 when, according to the Vita Ambrosii of Paulinus of Milan, two Persian noblemen presented themselves before Theodosius I at Mediolanum but departed the next day for Rome in order to see for themselves Petronius Probus.

Petronius Probus was buried in a mausoleum built for him by his wife Anicia Faltonia Proba on the Vatican Hill.

[6][7] As the most prestigious burial place beside Saint Peter's tomb in Old St Peter's Basilica had already been occupied by the sarcophagus of Probus's predecessor, the consul and praefectus urbanus Junius Bassus, Probus's mausoleum was constructed immediately outside the western apse of the basilica.

[6][7] Probus was interred at St Peter's many decades before the first pope buried there – Pope Leo I – was interred in 461, and in a position closer the apostle's tomb than was possible for the imperial Mausoleum of Honorius, attached to the basilica's southern transept in the early 5th century for the burials of the Theodosian dynasty.