Niconium was an ancient city on the east bank of the Dniester estuary, within the modern village Roksolana in the Ovidiopol district of the Odessa region.
It appears in the second half of the 6th century, and was the economic and political dependence on Istria. Stone construction in the city begins in the 5th century. At the turn of the 3rd-2nd centuries BCE, the city was destroyed, an event which was associated with the Macedonian commander Zopyrion, associate of Alexander the Great. In the 1st century ACE, the size of the city increased from the previous period. It is believed that life in Niconium ended around the time of the Great Migrations.
In the 5th-4th centuries BCE, the major money in Niconium were Istrian copper alloy coins. It is thought that Niconium itself produced these coins, dating between the years 470 BCE to 460 BCE. The seemingly haphazard statement attesting to the coins origination dating to the period of the reign of the Scythian king Scylas is confirmed by the fact that the Niconium coins have the name Scylas written on them.