Trabzon is a major city in Turkey with a rainy climate that makes it one of the greenest parts of the country. It has major roads, shipping traffic on the Black Sea, and an international airport. It is famous for its fish, football team, and Sumela Monastery.
When the Roman Empire split into two in the 4th century, Trabzon remained under Eastern Rome's (Byzantines) sovereignty. The Byzantines emphasized the importance of Trabzon in military standpoint. During Emperor Justinian's reign in the 6th century they repaired and enlarged city walls while improving communication routes and establishing Christianity to increase compliance among these tribes. The existent aqueducts of Saint Eugenius were built.
After the fights over the throne started in Imperial Byzantium (Istanbul) in the 12th century, Comnenus family was dethroned and Alexios Comnenus sought refuge in Georgia. With the help and support of Georgians, he declared his kingdom in Trabzon, then became a state capital.
In the 13th century, a group of Seljuk Turks besieged Trabzon and forced them to register for taxation. The King of Trabzon, Alexis Commenos, fortified the citadel with ditches dug around it. Outer parts became commercial areas and were mentioned as "The pupil of Asia". The palace of the King and official buildings were in high plains at inner fortress. Commercial life from Batum to Kerempe including Crimea that was in hands of Genoese and Venetians included coastal castles and warehouses also. The city was eventually conquered by Ottomans.