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| | Islamic History |
 | | Ibn Ishaq, one of the earliest biographers of the Prophet, says it was at about this time that Muhammad sent letters to the rulers of the earth - the King of Persia, the Emperor of Byzantium, the Negus of Abyssinia, and the Governor of Egypt among others - inviting them to submit to Islam. |
 | | Ibn Zuhr, known as Avenzoar, was the first to describe pericardial abscesses and to recommend tracheotomy when necessary as well as being a skilled practical physician, and Ibn Rushd wrote an important book on medical theories and precepts. |
 | | Ibn al-Haytham, for example, wrote The Book of Optics, in which he gives a detailed treatment of the anatomy of the eye, correctly deducing that the eye receives light from the object perceived and laying the foundation for modern photography. |
| www.ajjur.net /islamic%20history.htm (21015 words) |
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