What do Ibn al-Shatir and Ibn Tufail have in common?
Ibn al-Shatir Ibn al-Shatir or Ibn ash-Shatir (Arabic: ابن الشاطر‎ ‎ ; 1304–1375) was an Arab astronomer. He worked as "muwaqqit" (موقت, religious timekeeper) in the Umayyad Mosque in Damascus and constructed a sundial for its minaret in 1371/72.
Al-Ashraf Khalil Al-Ashraf Salāh ad-Dīn Khalil ibn Qalawūn (Arabic: الملك الأشرف صلاح الدين خليل بن قلاوون‎ ‎ ); (c. 1260s – 14 December 1293) was the eighth Mamluk sultan between November 1290 until his assassination in December 1293. He was well known for conquering the last of the Crusader states in Palestine in the capture of Acre in 1291.