The Sāmānid-era drive to Islamize Central Asia led not only to increased Islamic influence within the steppes, but, concomitantly, to the transformation of internal Muslim political life. Developments within the Muslim oecumene that were shaped or influenced by this Drang nach Osten range from the legitimizing of the political fragmentation of the Persianate Dynastic period to changes in Muslim military culture and practice, the successful religious conversion of the Turkic steppe; and growing Turkic influence inside the Sāmānid realms, culminating not only in the downfall of the Sāmānids, but in the end of the era of Iranian political and military dominance and the beginning of a millennium of Turkic political hegemony.