9th c Iraq; at the court of the Caliph Mā’mūn (198-218 /813-833) and at that of Muta`ṣim (218-227/833-841).  GAS V, 255-9; GAS VI, 151-5. Check Franz Rosenthal, “Kindîana”, From Arabic Books and Manuscripts II, Kindîana, JAOS 69 (1949): 149-152 
