Zosimus, New History 1.36

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 ZosimusNew 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.

[1.36.1] Valerian had by this time heard of the disturbances in Bithynia, but his district would not allow him to confide the defence of it to any of his generals. He therefore sent Felix to Byzantium, and went in person from Antioch into Cappadocia, and after he had done some injury to every city by which he passed, he returned homeward. But the plague then attacked his troops, and destroyed most of them, at the time when Sapor made an attempt upon the east, and reduced most of it into subjection. 

[1.36.2] In the mean time, Valerian became so effeminate and indolent, that he dispaired of ever recovering from the present ill state of affairs and would have concluded the war by a present of money, had not Sapor sent back the ambasadors who were sent to him with that proposal, without their errand, desiring the emperor to come and speak with him in person concerning the affairs he wished to adjust. To which he most imprudently consented, and going without consideration to Sapor with a small retinue, to treat for a peace, was presently laid hold of by the enemy, and so ended his days in the capacity of a slave among the Persians, to the disgrace of the Roman name in all future times.