The remains of this ancient Roman port and fortress were discovered by Felix Kanitz at the end of the 19th century in the north-western part of today`s city of Ruse, on an upland next to the bank of the Danube. Major excavations took place until 2006. In total, 50 m of the north-western fortification wall were brought to light, a tower, six buildings, a temple of Apollo and the Principia (headquarters) of the Roman military unit in Sexaginta Prista. It worked until the beginning of the 7th century AD and was a major base for the Imperial Roman Danube fleet. The complex is near the River station.