Constantinus I the Great (306-337) AE Follis (Bronze, 3.34g, 20mm) Siscia
Obv: CONSTANTINVS AVG, helmeted and cuirassed bust right
Rev: VIRTVS EXERCIT, standard inscribed VOT XX, bound captive seated to either side, S-F HL across fields, ASIS star-in-crescent in exergue.
Ref: RIC 127.