In the latter half of the 11th century, the Seljuk Turks began penetrating into medieval Armenia and the eastern regions of Anatolia. In 1071, the Seljuks defeated the Byzantines at the Battle of Manzikert, starting the Turkification process in the area; the Turkish language and Islam were introduced to Armenia and Anatolia, gradually spreading throughout the region. The slow transition from a predominantly Christian and Greek-speaking Anatolia to a predominantly Muslim and Turkish-speaking one was underway. The Mevlevi Order of dervishes, which was established in Konya during the 13th century by Sufi poet Celaleddin Rumi, played a significant role in the Islamization of the diverse people of Anatolia who had previously been Hellenized. Thus, alongside the Turkification of the territory, the culturally Persianized Seljuks set the basis for a Turko-Persian principal culture in Anatolia, which their eventual successors, the Ottomans, would take over.