Pope Pontian resigns. He is exiled to the mines of Sardinia, along with Hippolytus of Rome.

Pope Pontian was the bishop of Rome from 21 July 230 to 28 September 235. In 235, during the persecution of Christians in the reign of the Emperor Maximinus Thrax, Pontian was arrested and sent to the island of Sardinia.

Hippolytus of Rome was a Bishop of Rome and one of the most important second–third centuries Christian theologians, whose provenance, identity and corpus remain elusive to scholars and historians. Suggested communities include Rome, Palestine, Egypt, Anatolia and other regions of the Middle East. The best historians of literature in the ancient church, including Eusebius and Jerome, openly confess they cannot name where Hippolytus the biblical commentator and theologian served in leadership. They had read his works but did not possess evidence of his community. Photios I of Constantinople describes him in his Bibliotheca as a disciple of Irenaeus, who was said to be a disciple of Polycarp, and from the context of this passage it is supposed that he suggested that Hippolytus so styled himself. This assertion is doubtful. One older theory asserts he came into conflict with the popes of his time and seems to have headed a schismatic group as a rival to the bishop of Rome, thus becoming an antipope. In this view, he opposed the Roman Popes who softened the penitential system to accommodate the large number of new pagan converts. However, he was reconciled to the Church before he died as a martyr.

September 28 is the 271st day of the year in the Gregorian calendar; 94 days remain until the end of the year.