Antipope Natalius

https://en.wikipedia.org/wiki/Antipope_Natalius

Natalius (c. 199 – c. 200) was a figure in early church history who is sometimes considered to be the first antipope of Rome.

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