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.
Saf ibn Sayyad Saf ibn Sayyad (Arabic: الصف بن الصياد‎ ‎ ), later known as Abdullah ibn Sa'id (Arabic: عبد الله بن سعيد‎ ‎ ), was an alleged claimant of prophethood during the time of Islamic prophet Muhammad and his companions.