Thessaloniki instance of second largest city
Byzantine era and Middle Ages
From the first years of the Byzantine Empire, Thessaloniki was considered the second city in the Empire after Constantinople, both in terms of wealth and size, with a population of 150,000 in the mid-12th century. The city held this status until its transfer to Venetian control in 1423. In the 14th century, the city's population exceeded 100,000 to 150,000, making it larger than London at the time.During the sixth and seventh centuries, the area around Thessaloniki was invaded by Avars and Slavs, who unsuccessfully laid siege to the city several times, as narrated in the Miracles of Saint Demetrius. Traditional historiography stipulates that many Slavs settled in the hinterland of Thessaloniki; however, modern scholars consider this migration to have been on a much smaller scale than previously thought. In the ninth century, the Byzantine missionaries Cyril and Methodius, both natives of the city, created the first literary language of the Slavs, the Old Church Slavonic, most likely based on the Slavic dialect used in the hinterland of their hometown.A naval attack led by Byzantine converts to Islam (including Leo of Tripoli) in 904 resulted in the sack of the city.
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