108. Aurelius Victor [de Caesar. c. 39] ascribes the
abdication, which had been so variously accounted for, to
two causes; first, Diocletian's contempt of ambition, and
secondly, his apprehension of impending troubles. One of the
panegyrists (vi. [v.] 9) mentions the age and infirmities of
Diocletian as a very natural reason for his retirement .