However, he is not depicted as a warrior and conqueror, but as a seeker of truth who eventually finds the Ab-i Hayat (Water of Life).[76] Islamic Persian accounts of the Alexander legend, known as the Iskandarnamah, combined the Pseudo-Callisthenes material about Alexander, some of which is found in the Quran, with indigenous Sassanid Middle Persian ideas about Alexander. For example, Pseudo-Callisthenes is the source of many incidents in the Shahnama written by Ferdowsi (935–1020 AD) in New Persian. Persian sources on the Alexander legend devised a mythical genealogy for him whereby his mother was a concubine of Darius II, making him the half-brother of the last Achaemenid shah, Darius.