Tradition
St. Cyprian
The Epistles of Cyprian
Letter 55
To the People of Thibaris, Exhorting to Martyrdom.
Cyprian First of All Excuses Himself to the Thibaritans that He Had Not Been to Visit Them, and Gives Them Warning of the Persecution at Hand; He Then Furnishes Inducements Readily to Undergo Martyrdom.
Source: The Epistles of Cyprian (New Advent)