Tradition
Eusebius of Caesarea
Church History
Book 5 › Chapter 15
The Schism of Blastus at Rome
Others, of whom Florinus was chief, flourished at Rome. He fell from the presbyterate of the Church, and Blastus was involved in a similar fall. They also drew away many of the Church to their opinion, each striving to introduce his own innovations in respect to the truth.
Source: Church History (New Advent)