Boha-Eddin, Or Bohaddin, Abnl-Mohassen Yusuf Ibn Shedad, an Arabian scholar and historian, born in Mosul in 1145, died in Aleppo about 1233. Having attained proficiency in Moslem law, he became at the age of 27 a lecturer at Bagdad. In 1186 he made the pilgrimage to Mecca, and returned through the Holy Land, visiting Jerusalem, Hebron, and other sacred cities. While in Damascus, being summoned to the Moslem camp by Saladin, he wrote a treatise on the "Laws and Discipline of Sacred War," praising Saladin's policy. Saladin appointed him cadi of Jerusalem and of the army, and a strong attachment subsisted between them. On the death of Saladin he transferred his attachment to his son Malek Dhaher, whom he was instrumental in establishing on the throne of Aleppo. In return, Malek appointed Boha-eddin cadi of that city, which brought him constantlv to reside in the royal court. Aleppo now became the resort for men of science and learning, and Boha-eddin founded a college, where he continued to give lectures till his death.

His great work, the "Life of Saladin," was published by Schultens at Ley-den in 1732, with notes, maps, and a Latin translation.