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In page Novi Sad:

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In the Middle Ages, the area was controlled by the Ostrogoths, Gepids, Avars, Franks, West Slavic groups, again by the Byzantines, and finally by the Hungarians. It was a part of the medieval Kingdom of Hungary from its foundation in 1000 until the Ottoman invasion in the 16th century. Hungarians began to settle in the area, which before that time had been mostly populated by Slavs. The earliest known mention was as the Hungarian variant Peturwarad or Pétervárad (Serbian: Petrovaradin/Петроварадин), derived from the Byzantine variant, found in documents from 1237. That year, several other settlements were mentioned as existing in the territory of modern-day urban Novi Sad.[citation needed]