Final answer:
Mecca, Medina, Istanbul, Cairo, and Alexandria were important cities in early Islamic history.
Step-by-step explanation:
In early Islamic history, some important cities include Mecca and Medina, Istanbul and Cairo, and Alexandria. Mecca and Medina are significant because they are the birthplace and the burial place of the Islamic prophet Muhammad, respectively. Istanbul and Cairo were important centers of Islamic civilization, serving as political, cultural, and commercial hubs. Alexandria, located in Egypt, was also a vital center of learning and scholarship during this time.
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