Siscia became in the course of the 1st century the most important military outpost, a starting point for conquering the East. The urban agglomeration of Siscia is located on the left bank of the River Kupa on a surface of 40 ha inside the city walls. Outside of the walls are the necropolises located round the approaching roads.The site is specific by its location; the present day modern city of Sisak and its historical centre completely overlap the position of Roman Siscia.

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After Romans had conquered Segestica, they built Siscia on the left bank of the river Kupa (right below the centre of today's Sisak). Siscia was the capital town of the Province of Pannonia Savia, where 40,000 inhabitants resided. The town had the forum, basilicas, temples, an empire mint, a theatre and two ports. Christianity was spreading unstoppably and encompassed the town of Sisak. The first known Bishop of Sisak was Kvirin from 284 AD until his martyr's death, probably in the year 303 AD. With gradual collapse of the Roman Empire, the importance of Sisak declined and the great migration brought to Sisak Huns, Gauls, Avars and Slavs. Slav tribes remained in this area and eventually the Slav language became dominant.

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