ʿAmr b. Masʿada b. Saʿīd b. Ṣūl (d. probably 217/832) was a secretary and man of letters under the caliph al-Maʾmūn (r. 198-218/813-33). Probably of Turkish origin, he was a cousin of Ibrāhīm b. al-ʿAbbās al-Ṣūlī (d. 243/857), a prominent ʿAbbāsid kātib . His father, said by al-Jahshiyārī (d. 331/942) to have been a client (mawlā) of Khālid b. ʿAbdallāh al-Qasrī (d. 126/743), a major Umayyad figure, had been secretary of the chancellery under the caliph al-Manṣūr (r.