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The Arab siege of Constantinople in 717-718, (commonly known as the second Arab siege) is regarded as one of the most important battles in European history. This was the most determined effort by the Caliphs to conquer the Byzantine Empire. Emperor Leo III managed to defeat the besieging Muslims army and navy. This had the following important consequences it battle saved the successor state to the Roman Empire and allowed it was to continue in one form or for another for over 600 years. It ended the Arab campaign to conquer the Byzantines and helped to undermine the Umayyad Caliphate. Moreover, the Byzantine victory prevented the Muslims from entering Eastern Europe, therefore preventing the Islamization of the region. Finally, the siege also indirectly led to a religious revolution known as Iconoclasm.