Zosimus, New History 2.08
Zosimus (Greek Ζώσιμος): Early Byzantine, pagan author of a history of the Roman Empire, published in the first quarter of the sixth century CE.
The translation of Zosimus' New History offered here was printed in 1814 by W. Green and T. Chaplin in London, and was probably prepared by J. Davis of the Military Chronicle and Military Classics Office. The translator is anonymous. The text was found at Tertullian.org. The notes were added by Jona Lendering.
[2.8.1] Three years after Diocletian died, and the reigning emperors, Constantius and Maximian Galerius declared Severus and Maximinus (who was nephew to Galerius), the caesars, giving all Italy to Severus, and the eastern provinces to Maximinus.
[2.8.2] Affairs being all regulated and the barbarians quiet, since the Romans had been so successful against them, Constantine, who was the son of Constantius by a concubine, and had previously an ambition of being emperor (but was more inflamed with that desire, since Severus and Maximinus had acquired the name and honor of caesars), was now resolved to leave the place where he had resided, and to go to his father Constantius, who was beyond the Alps, and generally in Britain.
[2.8.3] But being apprehensive of seizure by the way, many persons being well acquainted of his anxiety for dominion, he maimed all the horses that were kept for public service, whenever he came to any stable where they were kept, except what he took for his own use. He continued to do this throughout his journey, by which means he prevented those that pursued him from going further, while he himself proceeded toward the country where his father was.