Uzun Hasan's conquest of most of mainland Iran shifted the seat of power to the east, where the Aq Qoyunlu adopted Iranian customs for administration and culture. In the Iranian areas, Uzun Hasan preserved the previous bureaucratic structure along with its secretaries, who belonged to families that had in a number of instances served under different dynasties for several generations. The four top civil posts of the Aq Qoyunlu were all occupied by Iranians, which under Uzun Hasan included; the vizier, who led the great council ("divan"); the mostawfi al-mamalek, high-ranking financial accountants; the "mohrdar", who affixed the state seal; and the "marakur" "stable master", who supervised the royal court. Culture flourished under the Aq Qoyunlu, who, although of coming from a Turkic background, sponsored Iranian culture. Uzun Hasan himself adopted it and ruled in the style of an Iranian king.