In Roman times, Rhizinium (today Risan) is documented as an oppidum civium Romanorum. Two Roman routes led through the Bay of Kotor. The most prosperous time for Roman Rhizinium came during the first and second centuries. Five mosaics are the most valuable remains of that period – not only for Risan but also for Montenegro. The best preserved one shows Hypnos, the Greek deity of dreams. It is the only known image of this kind in the Balkans. The famous English archeologist Sir Arthur Evans led those initial excavations.