Neoclassical city center was then built, focused on the newly-planned Round Square. In 1784 Petrozavodsk was large enough to supplant Olonets as the administrative center of the region. Although Emperor Paul abolished Olonets Governorate, it was revived as a separate guberniya in 1801, with Petrozavodsk as its administrative center.
During the Finnish occupation of East Karelia in the Continuation War (1941�1944), the occupier chose to style the city ��nislinna (or ��neslinna), rather than the traditional Petroskoi. The new name was a literal translation of One gaborg, the name of a settlement marked on a 16th century map by Abraham Ortelius near the present-day city,��ninen being the Finnish to ponym for Lake Onega.
The city was occupied by Finnish troops for nearly three years before it was retaken by Soviet forces on June 28, 1944. The Finns set up concentration camps for the civilians which they operated until the Red Army reoccupied the area. The first camp was located at Petrozavodsk (October 24, 1940). Six such camps were set up in Petrozavodsk, with about 25,000 women, children and old people confined in them. One source estimated 4,000 people perished there, primarily because of malnourishment, most dying during the spring and summer of 1942
