According to Cleveland, the devshirme system offered "limitless opportunities to the young men who became a part of it." Basilike Papoulia wrote that "...the devishirme was the 'forcible removal', in the form of a tribute, of children of the Christian subjects from their ethnic, religious and cultural environment and their transportation into the Turkish-Islamic environment with the aim of employing them in the service of the Palace, the army, and the state, whereby they were on the one hand to serve the Sultan as slaves and freedmen and on the other to form the ruling class of the State." Accordingly, Papoulia agrees with Hamilton Alexander Rosskeen Gibb and Harold Bowen, authors of "Islamic Society and the West", that the devshirme was a penalization imposed on the Balkan peoples since their ancestors resisted the Ottoman invasion. Vladimir Minorsky states, "The most striking manifestation of this fact is the unprecedented system of devshirme, i.e. the periodic conscription of 'tribute boys', by which the children of Christians were wrung from their families, churches, and communities to be molded into Ottoman praetorians owing their allegiance to the Sultan and the official faith of Islam." This system as explained by Çandarlı Kara Halil Hayreddin Pasha, founder of the Janissaries, ""The conquered are slaves of the conquerors, to whom their goods, their women, and their children belong as lawful possession"".