Abū 'l-Ḥasan al-Muḫtār Yuwānnīs ibn al-Ḥasan ibn ʿAbdūn ibn Saʿdūn ibn Buṭlān (Arabic: أبو الحسن المختار إيوانيس بن الحسن بن عبدون بن سعدون بن بطلان ; c. 1001 to 1025 – 8 Šauwāl 458 AH or 2 September 1066), commonly known as Ibn Buṭlān (ابن بطلان ), was an Arab physician and Nestorian Christian theologian. Born in Baghdad, the erstwhile capital city of the Abbasid Caliphate, he travelled throughout Mesopotamia, Syria, Egypt, and Anatolia, during which time he practiced medicine, studied, wrote, and engaged in intellectual debates—most famously the Battle of the Physicians with the Egyptian polymath Ibn Riḍwān. In 1054, he was in Constantinople, the capital city of the Byzantine Empire, where he witnessed first-hand the East–West Schism among Christendom, contributing a work to the discussions surrounding it for Michael I Cerularius, who was serving as the Patriarch of Constantinople.
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