c.786 - 833
Al-Mamun was the son of Harun al-Rashid. He was the greatest patron of philosophy and science in the history of Islam. He encouraged on holding disputes in court on logical, theological, and legal matters.
Al-Mamun established in Baghdad his famous 'Bayt al-Hikmah'
(House of Wisdom), combining a library and an academy. The library contained books
on all subjects, such as literature, natural sciences, and logic.