T-S Ar.38.123
Recto: deed of sale for part of a house. One of the parties is Abū Naṣr Manṣūr Ibn al-ʿAynzarbī, "one of the entourage of al-Ḥāfiẓ" (the Fatimid caliph al-Ḥāfiẓ who reigned 1131–49 CE). This is a famous physician: see https://scholarlyeditions.brill.com/reader/urn:cts:arabicLit:0668IbnAbiUsaibia.Tabaqatalatibba.lhom-tr-eng1:14.29. (See also T-S NS 264.22, which mentions a volume in the handwriting of Ibn al-ʿAynzarbī. It's possible that fragments in his handwriting have been preserved in the Geniza—Ibn Abī Uṣaybiʿa emphasizes that Ibn al-ʿAynzarbī was an excellent and prolific scribe.) This document also mentions Karīm al-Dawla ʿAytham, "one of the great amirs of al-Ḥāfiẓ." The verso document also concerns the purchase of the property on the recto, and mentions the Amīr Athīr al-Mulk Sharaf al-Dawla wa-Fārisuhā, Abū Saʿd b. Abū ʿImrān ‘the Jewish moneychanger’, Sitt al-Jamāl bt. Abū Saʿd b. Abū ʿImrān, Abū l-Faḍāʾil Muḥammad Ibn al-Qāḍī, and Maḥmūd, and was witnessed by ʿAbd al-Salām. (Information in part from CUDL.) ASE
Editor: Ed. and trans. Geoffrey Khan, Arabic Legal and Administrative Documents in the Cambridge Genizah Collections (1993).