The caliphs and their nonï؟1/2Muslim subjects; a critical study of the Covenant of ï؟1/2Umar, 2026-02-15T19:39:52+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Tritton, A. S. (Arthur Stanley), 1881ï؟1/21973 (Islam and the Muslim world, 1970)