As the Byzantine empire weakened, their cities in Asia Minor could resist the assaults of the beyliks less and less, and many Turks gradually settled in the western parts of Anatolia.This process is described in the pioneering work, Speros Vryonis, The decline of medieval Hellenism in Asia Minor: and the process of Islamization from the eleventh through the fifteenth century (Berkeley: University of California, 1971), As a result, many more beyliks were founded in these newly conquered western regions who entered into power struggles with the Byzantines, the Genoese, the Knights Templar as well as between each other.
