Human settlements on the river Neretva, between the Hum Hill and the Velez mountain, have existed since prehistory. The name of Mostar was first mentioned in a document dating from 1474, taking its name from the bridge-keepers (mostari). The stone bridge, the Old Bridge (Stari Most), was erected in 1566 on the orders of Suleiman the Magnificent, the Ottoman ruler. Later becoming the cityâ€™s symbol, the Old Bridge is one of the most important structures of the Ottoman era and perhaps Bosniaâ€™s most recognizable architectural piece. The famous traveler Evliya Ã‡elebi wrote in the 17th century that “the bridge is like a rainbow arch soaring up to the skies, extending from one cliff to the other. …I, a poor and miserable slave of Allah, have passed through 16 countries, but I have never seen such a high bridge.” Mostar is the sunniest city in the country with an average of 2291 solar hours a year.