(about 1050 A.D).
Abū-l-Ḥasan Alī Ibn Riḍwān. An Egyptian physician who wrote a treatise on Medicine. Daf’ madārr al-abdān bi-ard Miṣr
MS.: Cairo, Dār al-Kutūb, MS 18, quoted by Maqrizi (Wiet I, 1, p. 186).
T. : MC 726 r A:1
[p. 241] Burning heat and drought are predominant characteristics of the climate of this place [i.e. Aswān], because the sun heat absorbs all the humidity. For this reason also the local population has a black complexion and kinky hair because of the burning heat of their land. (MC 726 r.).