Honoratus, bishop of Constantina in Africa wrote a letter to one Arcadius who on account of his confession of the catholic faith had been exiled to Africa by King Genseric. This letter was an exhortation to endure hardness for Christ and fortified by modern examples and scripture illustrations showing that perseverance in the confession of the faith not only purges past sins but also procures the blessing of martyrdom.
Source: Illustrious Men (Supplement to Jerome) (New Advent)