Mint: Siscia (Sisak, Croatia)
Abbreviation: SIS, SISC
The mint at Siscia was first opened by Gallienus in AD 262 and was operational until AD 383. During the 4th century its coins carried the mintmark SIS or SISC. During this period, coins struck at Siscia are not common finds in the UK compared with those of the more westerly mints.