Eutrop. ix. 19 . Victor in Epitome [c. 39]. The town seems to have been properly called Doclia, from a small tribe of Illyrians (see Cellarius, Geograph. Antiqua, tom. i. p. 393); and the original name of the fortunate slave was probably Docles; he first lengthened it to the Grecian harmony of Diocles, and at length to the Roman majesty of Diocletianus. He likewise assumed the Patrician name of Valerius, and it is usually given him by Aurelius Victor.