Natalius was a figure in early church history who is sometimes considered to be the first antipope of Rome.^[1]

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The only information about Natalius is a quote from an unnamed earlier writer by Eusebius,^[2] telling of a 3rd-century priest who accepted the bishopric of the Adoptionists,^[1] which was seen as a heretical group in Rome. Natalius soon repented and tearfully begged Pope Zephyrinus to receive him into communion.^[3][4]

According to the accounts, Natalius became the head of this Christian community, due to the influence of the theologians, Asclepius and Theodotus the Younger, disciples of Theodotus of Byzantium. Theodotus had been excommunicated in 190 by Pope Victor I for his teachings, and this caused a schism, albeit of small proportions, within the Church. Theodotus, a leather merchant and a scholar of Greek culture, argued that Jesus was at first an ordinary man, in whom the Logos, God or the Wisdom of God dwelt "as in a temple", as it had been with Moses and the prophets. This had happened at his baptism, when he received the divine grace or adoption (dynamis) and thus became equally divine, his divinity being inferior to that of the Father (God or Logos). This doctrine, called dynamic monarchianism, was both Ebionistic and Adhocianistic.^{[citation needed]}

• List of papal elections
• Papal conclave
• Papal selection before 1059