Address to the Emperor Theodosius by Salaminius Hermias Sozomen, and Proposal for an Ecclesiastical History
The popular saying is, that the former emperors were zealous about some useful matter or other; such as were fond of ornaments, cared for the royal purple, the crown, and the like; those who were studious of letters, composed some mythical work or treatise capable of fascinating its readers; those who were practiced in war, sought to send the weapon straight to the mark, to hit wild beasts, to hurl the spear, or to leap upon the horse. Every one who was devoted to a craft which was pleasing to the rulers announced himself at the palace. One brings a precious stone not easily susceptible of polish; another undertakes to prepare a more brilliant color than the purple robe; one dedicates a poem or treatise; another introduces an expert and strange fashion of armor.
Source: Ecclesiastical History (New Advent)