Final answer:
The size of the Byzantine Empire decreased between 550 and 1360.
Step-by-step explanation:
The size of the Byzantine Empire changed between 550 and 1360. Initially, in the mid-6th century, the Byzantine Empire was at its greatest extent, covering a large area in Europe, North Africa, and the eastern Mediterranean. However, over time, the empire gradually lost territories due to various factors, including conflicts with Islamic polities and Arab invasions. By the mid-8th century, the empire's boundaries had constricted significantly, and by the mid-14th century, it had greatly decreased in size.