Likewise, the city's later fall to the Arab conqueror ‘Amr ibn al-ʿĀṣ in 642 C.E. made Islam dominant in Egypt, as it has remained since. Unfortunately, ancient Alexandria's most important ...

Empereur: From the fourth century until the 14th century there were earthquakes in Alexandria. In the Arab sources alone you have more than 20 mentions of earthquakes which affected the lighthouse.