While the other vitae give Egypt as the place of his banishment, vita iv.
The story is a very old one, first found in the Vitae Patrum, X, cap.
Florentissimos vitae annos colligendo et laborando eidem impendit.
This study left its mark on mediaeval sermons and Vitae Sanctorum.
See the contemporary life by Vitorelli, continuator of Ciaconius, Vitae et res gestae summorum pontiff.