addendum : The Caliphates were established and ran from 661-1258...The continuation of the Caliphates being the 'Ottoman Empire' established during this period(1258)...The Ottoman Empire lasted until 1920 then went underground and reemerged as the Al Qaeda we see today! So my referring to the Ottoman Empire burning the Alexandria Libraries was correct as they were then called Caliphates and are now called al Qaeda...!end of story!
History for Dummies: 101...
The term Caliph translates roughly as 'Leader of the Muslims' and is the equivilent of the Celtic 'High King' or Latinised 'Emperor'.
There have been many Muslim empires, from the Umayyads, Abbasids, Fatimids to the Ottoman.
There have been many Christian empires, from the Roman, to the Byzantine to the German Holy Roman to the Spanish and British.
To claim that the Ottoman is even a re-emergence of older Muslim empires such as the Fatimids is as disingenuious as stating that the British empire was a re-emergence of the Roman empire.
To claim that AQ are a re-emergence of the Ottoman empire is as disingenuious as claiming that those that plan the American empire (ie PNAC) are a continuation of the British empire.
What you are struggling with is the fact that each of the empires were Muslim. From this, you are attempting to deduce that all Muslim empires were the same, simply re-emergences of each other.
As for the library, as mentioned above, the date of the destruction of the library is unknown, and could be any time from the invasion of Julius Caesar in circa 50BC. What is known is the fact that the Muslim invaders preserved the library intact, which explains why much of it exists today.
Again, you are a moron...