Abū Thawr Ibrāhīm b. Khālid b. Abī l-Yamān al-Kalbī (d. 240/854) was a Baghdadi legal scholar (faqīh) and traditionist (muḥaddith) who may have founded his own school of law (madhhab) and was later associated with the spread of the Shāfiʿī madhhab . He died in 240/854, at approximately seventy years of age. Details of Abū Thawr's life are vague. The sources indicate that he lived in Baghdad, where he met al-Shāfiʿī (d. 204/820) and other prominent scholars. Any travels he may have undertaken are