Ibn Fadl's rare classic covering subjects such as geography, biographies, history, poetry & literature, science and more. The method al-Umari ( d. 749 H) uses in his masterpiece was such as modern encyclopedias; with year by year chronology. Ahmad ibn Yahya ibn Fadl Allah al-'Umari (700/1301-749/1349). Ibn Fadl's the book shows a sense of time and place from the perspective of an Arab Muslim. This compendium also relates administrative practices in the kingdoms of the Mamluk period.