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Sisak is a city in central Croatia, spanning the confluence of the Kupa, Sava and Odra rivers, 57 km southeast of the Croatian capital Zagreb, and is usually considered to be where the Posavina begins, with an elevation of 99 m.
The Romans controlled Poetovium until the 1st century BC. It became the base camp of the Legio XIII Gemina, where they built a castrum.
Carnuntum was a Roman legionary fortress and headquarters of the Pannonian fleet from 50 AD. After the 1st century, it was capital of the Pannonia Superior province. It also became a large city of 50,000 inhabitants.
Brigetio, which became Szőny, was an independent town until 1977, when it was incorporated into Komárom. The Roman legion Legio I Adiutrix was stationed here from 86 AD until the middle of the 5th century.