The 300s decade ran from January 1, 300, to December 31, 309.
The 280's decade ran from January 1, 280, to December 31, 289.
Adrian of Nicomedia or Saint Adrian was a Herculian Guard of the Roman Emperor Galerius Maximian. After becoming a convert to Christianity with his wife Natalia (Ναταλία), Adrian was martyred at Nicomedia in Asia-Minor (Turkey). Adrian was the chief military saint of Northern Europe for many ages, second only to Saint George, and is much revered in Flanders, Germany and the north of France.
Clement of Rome, also known as Pope Clement I, was the bishop of Rome in the late first century AD. He is considered to be the first of the Apostolic Fathers of the Church, and a leading member of the Church in Rome in the late 1st century.
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 of Caesarea 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 30 - Eastern Orthodox liturgical calendar - October 2
September 29 - Eastern Orthodox liturgical calendar - October 1
Saint Anastasia is a Christian saint and martyr who died at Sirmium in the Roman province of Pannonia Secunda. In the Eastern Orthodox Church, she is venerated as St. Anastasia the Pharmakolytria, i.e. "Deliverer from Potions". This epithet is also translated as "One who Cures (Wounds)" in Lampe's A Patristic Greek Lexicon.
August 12 - Eastern Orthodox liturgical calendar - August 14
The Forty Martyrs of Sebaste or the Holy Forty were a group of Roman soldiers in the Legio XII Fulminata whose martyrdom in the year 320 AD for the Christian faith is recounted in traditional martyrologies.
Saint Kyriaki, also known as Saint Kyriaki the Great Martyr, is a Christian saint, who was martyred under the emperor Diocletian.
Saint Alexander may refer to one of several saints including:
Saints Cyrus and John are venerated as martyrs. They are especially venerated by the Coptic Church and surnamed Wonderworking Unmercenaries because they healed the sick free of charge.
Rictius Varus was a Vicarius in Roman Gaul at the end of the 3rd century, around the time of the Diocletianic Persecution. The Roman Martyrology contains many references to the prefect Rixius Varus, who is said to have persecuted hundreds of Christians. In Christian hagiography he later repented and became a Christian martyr himself, and is regarded a Saint in the Eastern Orthodox and Roman Catholic Churches, with his feast day on July 6.
The 20,000 Martyrs of Nicomedia refers to victims of persecution of Christians in Nicomedia, Bithynia by the Roman emperors Diocletian and Maximian in the early 4th century AD.
Astius is a 2nd-century Christian martyr venerated by the Roman Catholic and Eastern Orthodox churches. He was the bishop of Dyrrhachium.
August 20 - Eastern Orthodox liturgical calendar - August 22
August 21 - Eastern Orthodox liturgical calendar - August 23
August 29 - Eastern Orthodox liturgical calendar - August 31
March 15 - Eastern Orthodox liturgical calendar - March 17
