X-Nico

Crossroads to Islam: The Origins of the Arab Religion and the Arab State

The evidence presented by the authors effectively corroborate the view of other scholars, such as Fred Donner's historiographical work, John Wansbrough or Patricia Crone and Michael Cook's book Hagarism who on different grounds propose that Islam and the Qu'ran were not the work of Muhammad or the Arabic deity.

Islamic calendar

Though Cook and Crone in Hagarism: The Making of the Islamic World cite a coin from 17 AH, the first surviving attested use of a Hijri calendar date alongside a date in another calendar (Coptic) is on a papyrus from Egypt in 22 AH, PERF 558.

see also