Al-Tabarî's acquisition of knowledge was to embrace not only history, Qur'an exegesis, Hadith and Fiqh, but he also possibly wrote in the field of ethics and had an educated person's interest in Arabic poetry. In Ta'rikh ar-Rusul wa'l-Muluk, a work that took forty years to complete, Al Tabarî looks at Antiquity and the Islamic period up to 915. As an objective historian, he hardly expresses any judgment, and keeps a global vision of history.
For more detail click here.
