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At that time he particularly devoted himself to the study of history, and the great works which he wrote were the fruit of his long employment in the Mustansiriyyah, He remained in Baghdad till his death on 3rd Muhar• ram.
was, according to Ibn Shakir, in twenty volumes, and lbn 'Imad has called it the biggest work on dogmatic theology in which the existence of God and man's meet• ing Him were discussed.
7. · Mu'jam ash-Shuyukh was a very important compilation; it was a biographical work on those five hundred scholars from whom the author himself had gained his knowledge of Tradition, and by whom he was permitted to transmit it to others.
Ibn al-Fuwatl himself has noted this in the course of his account of Hulaku Khan under the title Malik al-Ar Ibn al-Fuwati stayed for a long time at Maraghah : his quarters were in the precincts of the observatory near those of Naslr ad-Din. This long period-from 657 to 679 A.
The great library, composed of rare and unique books, the occasi• onal interviews with scholars from distant places, the great teacher of the time, Nasir ad-Din, always at his disposal, and, above all, the academic atmosphere created there, were altogether a great source of contentment for Ibn al-Fuwati who spent twenty years there, the best part of his life, in minute study.
Under the tutorship of Khwajah Nasir ad-Din, Ibn al-Fuwati studiedphilosophy and logic, proof of which is available from his great work, Ad-Durar al-Asdai.