 Complete the following phrase:  In 1153, the Arabic Muslim geographer Muhammad al-Idrisi described the settlement as an important mercantile place and that is the first historical mentioning of the town. There is no deed or other evidence of founding the city. Todays urban area was administered by the Bulgarian Empire until the begin of the 11th century, then by the Kingdom of Hungary until the 16th century, when it became part of the Ottoman Empire in 