Risan (Serbian: Рисан, rîsan) is a town in the Bay of Kotor, Montenegro. It traces its origins to the ancient settlement of Rhizon, the oldest settlement in the Bay of Kotor. Lying in the innermost portion of the bay, the settlement was protected from the interior by inaccessible limestone cliffs of the Orjen mountain which are the highest range of eastern Adriatic, and through several following narrow straits in the Bay of Kotor from the open sea. While the Krivošije karst plateau that hangs steep above the narrow shores of Risan bay receives over 5000 mm rain annually (European record), several strong karst springs that form a short brook collect in the narrow cultivable belt at Risan. The town was called Risinium in Latin. It is possibly related to Albanian "rrjedh", meaning "flow, stream" Rhizon The earliest mention of Rhizon dates back to the 4th century BC, as the main fortress in the Illyrian state where Queen Teuta took refuge during the Illyrian Wars. The degree of Hellenization at Rhizon was very high. In Roman times, Rhizinium is documented as an oppidum civium Romanorum, and the most prosperous time for Roman Rhizinium came during the 1st and 2nd centuries, when huge villas were made in the area and the city had 10,000 inhabitants. Five mosaics are the most valuable remains of that period - not only for Risan but also for Montenegro. Circa 500 it became the see of the Roman Catholic Diocese of Risano. The invasions of the Avars and Slavs left the city deserted. The last reference of a Roman bishop in Risan dates back to 595. In the 10th century, the Byzantine emperor Constantine Porphyrogenitus includes Risan among the inhabited towns of Travunia, while the priest of Doclea considers Rissena to be a district. During the Middle Ages, Risan lost the significance it used to have in the ancient times. No later than the 13th century, the Italians provided the bulk of a henceforward unbroken series of Latin Catholic Bishops of Risano until its suppression circa 1630. In the mid-15th century, Risan was referred to as a town of Herceg Stjepan.