Library 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.
English translation by Arthur Cushman McGiffert, in Nicene and Post-Nicene Fathers, Series II, Vol. I (eds. Philip Schaff and Henry Wace; Buffalo: Christian Literature Publishing Co., 1890). Public domain. Digital text via New Advent Church Fathers.