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At the time of Caliph Omar's invasion of Egypt, the Arab officer on duty in the destruction of the library of Alexandria used two stamps with which he marked the books. One said: 'Does not agree with the Koran - heretic, must be burned'. The other said: 'Agrees with the Koran - superfluous, must be burned'. -- Nils Kjaer
...until the Crusades Islam was indistinguishable from Judaism and... only then did it receive its independent character, while Muhammad and the first Caliphs are mythical figures. -- Nikolai Alexandrovich Morozov
"Pay him what was promised", said the caliph. "And put out his eyes." -- John Brunner
If Abu Bakr is dead and Umar is Caliph, then we hear and obey. -- Khalid ibn al-Walid
The Taliban has a huge leadership problem at a critical political moment, another caliph has announced himself to the world, and the Taliban has been silent. And that is getting noticed by militants across South Asia. -- Graeme Smith
Khalif (Caliph) Al-Ma'mun's period of rule (813 - 833 C.E.) may be considered the 'golden age' of science and learning. He had always been devoted to books and to learned pursuits. His brilliant mind was interested in every form of intellectual activity. Not only poetry but also philosophy, theology, astronomy, medicine and law all occupied his time. -- John Bagot Glubb

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