The History commenced with the Creation, followed by accounts regarding the patriarchs, prophets, and rulers of antiquity. The history of the Sasanian Empire came next. For the period of the Prophet's life, al-Ṭabarī drew upon the extensive researches of 8th-century Medinan scholars. Although pre-Islamic influences are evident in their works, the Medinan perspective of Muslim history evolved as a theocentric (god-centred) universal history of prophecy culminating in the career of Muhammad and not as a continuum of tribal wars and values.