al-Yasaʿ b. ʿUmar b. Mūsā
Name variants:
- al-Yasaʿ b. ʿUmar b. Mūsā: P.Cair.EgLib.inv. Taʾrīkh 1899, P.Mich.inv. 5634
Origin: Ṭuṭūn
Witness in two sale contracts dated 341 AH (P.Cair.EgLib.inv. Taʾrīḫ 1899 recto) and 350 AH (P.Mich.inv. 3654).
Establishing Groups, Identifying Patterns in Texts from Original Sources