Procopius BI 17mm. Heraclea, AD 365-366. PROCOPIVS P F AVG, pearl-diademed, draped and cuirassed bust to left / REPARATIO FEL TEMP, emperor standing facing, head to right, holding labarum and resting hand on shield; christogram in upper right field, SMHΓ in exergue. RIC IX 7. 2.62g, 17mm, 11h. Procopius (Ancient Greek: Προκόπιος) (c. 325/326 – 27 May 366 AD) was a Roman usurper against Valens, and a member of the Constantinian dynasty.and later Bithynia.

Though Valens initially despaired of subduing the rebellion, and was inclined to come to terms with the usurper, he quickly rallied, guided by the counsels of Salutius and Arintheus, and the superior ability of his generals prevailed in two battles at Thyatira and Nacolia where Procopius' forces were defeated. He fled the battlefield, and was for a while a fugitive in the wilds of Phrygia, but was soon betrayed to Valens due to the treachery of his two generals Agilonius and Gomoarius (they had been promised they would be "shown favour" by Valens), he was captured. Valens had his rival executed  on 27 May 366  by being fastened to two trees bent down with force; when the trees were released, Procopius was ripped apart in the manner of the legendary execution of the bandit Sinis. The "favour" Valens showed to Agilonius and Gomoarius was to have them both sawn asunder.