Of course, the love of woman, the desire for adventure, hope of economic independence through rewards of land and removal of onerous taxes, disgust with the Byzantine administration and with the lack of support from their rulers and ecclesiastical authorities--these influences did not cause the conversion of all the Christians. In the cities, where the inequality and the inconvenience of remaining true to the old faith was minimized, and where Christianity has always been able to make itself felt and heard,[148] there was no great temptation to a change of religion. After the Osmanlis became stronger, and entered into the aggressive period of conquest, they resorted to other means to swell their numbers. The institution of the Janissaries, and the permission to enslave those whom they conquered, gave the Osmanlis more potent and immediately pressing arguments. From the completion of the conquest of Bithynia by Orkhan, the Osmanlis can be called a distinct race with a national consciousness and a desire for expansion. They can be distinguished from the Turks of the emirates of Asia Minor and from the Byzantines. The Turk did not absorb the Greek, nor did the Greek absorb the Turk. Both had taken a new religion, and if the Turkish language was adopted, it was rather the customs and laws of the Byzantines which prevailed until the influence of the Arabs, enhanced as it was with the prestige of centuries of Islam, gained the ascendancy over Turkish and Byzantine tradition alike. But this did not occur until the Osmanlis invaded Syria, Egypt, and Mesopotamia at the beginning of the sixteenth century. It must be remembered that the Greeks were not the only element added to the Turkish stock. The adoption of the Turkish language by the Osmanlis was due not only to the fact that from the beginning it was the military and governmental language, but to its being the simplest and most vigorous medium of communication for the different peoples who became Osmanlis. Calling the Osmanlis Turks, and regarding them as invaders upon the soil of Europe, is an historical error which has persisted so long that the Osmanlis themselves have fallen into it! They have always distinguished themselves from the Turks. This is proved by their own use of that word to describe a people as different from themselves as were the Greeks. Evliya effendi spoke of the ‘harsh language of the Turks’, and said of Turbeli Koïlik, which was conquered by Osman in 1312, ‘Though its inhabitants are Turks, it is a sweet town.’[149] Hadji Khalfa regarded the Turks as synonymous with the Tartars, and an altogether foreign race.[150]