Thus, Wansbrough argued that the Quran "became a source for biography, exegesis, jurisprudence and grammar". around the 2nd/3rd century AH in Abbasid Iraq (not the 1st-century Hijaz, Western Arabia) as traditionally dated and located. Specifically Wansbrough thinks it must have been completed by Ibn Hisham around the time he composed his "Sīra" of Muhammad because of the "preponderance of Quran-based (historicized) narratives therein". Wansbrough thought evidence for the "seventh-century Hijaz" as the location of the Islam's origins was "ereft of archaeological witness and hardly attested in pre-Islamic Arabic or external sources", but instead owed "its historiographical existence almost entirely to the creative endeavour of Muslim and Orientalist scholarhship".