Petrovaradin (Serbian Cyrillic: Петроварадин) is a town and municipality in Serbia, part of the agglomeration of Novi Sad. Its population is more than 14000 people. The name of the city was changed several times. It was found by by Celts but the original name was unknown.Then, it was known as Cusum during Roman administration.
Later, the town received its name from the Byzantines, who called it Petrikon or Petrikov (Πετρικον) and who presumably named it after Saint Peter.
In documents from 1237, the town was first mentioned under the name Petrovaradin (Pétervárad).