Constantine I , Follis, Sirmium, 324-325 AD. Obv: CONSTAN-TINVS AVG Laureate head right Rev: SARMATIA DEVICTA Victory advancing right, holding trophy, palm branch and spurning captive on ground to right. Exe: SIRM, Sirmium mint RIC VII 475, 48; Hunter 195, 264. 21 MM. , 2,68 grams From what I have read ten Roman emperors were born in this city or in its surroundings: Herennius Etruscus (251), Hostilian (251), Decius (249–51), Claudius II (268-270), Quintillus (270), Aurelian (270–75), Probus (276–82), Maximian (285–310), Constantius II (337–61), and Gratian (367–83). The Sirmium mint was a Roman province in Pannonia inferior, present day Serbia. It was conquered by the Romans in the 1st century BC and proclaimed one of the four capitals of the Roman empire in 294 AD. the other three capitals were Trier, Mediolanum, and Nicomedia. The city had an Imperial palace, horse racing arena, an arena theatre, theatre, many workshops, public baths, temples, public palaces, luxury villas and of course the mint of Sirmium that was connected to the mint of Salona and the silver mines of the Dinaric alps. Here is a link to more information about Sirmium. https://www.livius.org/articles/place/sirmium-sremska-mitrovica/ If you have any coins from Sirmium please feel free to post them up for everyone to see.