A second vehicle for both administration and oppression that the Turks employed--in addition to the land administrators--was the Greek Orthodox Church. By 1394, before the final conquest, the See of Turnovo had been subordinated to the Patriarchate of Constantinople, where it remained until 1870. Greek bishops replaced Bulgarians, as Greek liturgy replaced the Slavic. The patriarchate, in turn, was totally subordinate to the sultan. The Greek clergy destroyed Bulgarian books and banned Slavic liturgy. The Bulgarian language and all Slavic literature were forbidden. Greek became the language in all schools.
The hellenization of the Bulgarian church was used by the Turks as a means to negate the nationalism of the people and thus dominate them. The Turks attempted to some extent to convert the Bulgarians to Islam in order to assimilate them more fully. Although many Bulgarians fled to the mountains with the coming of the Turks, others stayed on and accepted the Muslim faith, often for purely opportunistic purposes. Those who did were generally placed in strategically significant positions; frequently, as a reward for their conversion, they paid no taxes to the state. The Bulgarian converts to Islam were called Pomaks (see ch. 4).
The plight of the peasants grew worse. Agricultural production dropped as their exploitation continued. Although landowners were not persecuted to the same degree as the peasantry, they were frequently displaced from the land. Turkish cattle breeders entered the country to settle on their lands. Lands were also taken to reward army commanders, provincial governors, and knights in the service of the sultan. Still other lands were given to immigrant Turkish peasants. The only food that was not subject to requisition by the conquerors was pork, which was not allowed in the Muslim diet.
As the life of the Bulgarian countryside declined, so too did urban life. Bulgarians were expelled from most urban centers and replaced by Greeks, Armenians, Jews, and Turks. By the end of the sixteenth century two-thirds of Sofia's population was Turkish. Trade was virtually halted for a time, and, when resumed, it also was dominated by Greeks, Armenians, and Jews rather than Bulgarians. The towns themselves were in a state of deterioration. The crafts had declined, economic life was stagnant, and the Black Sea was closed to all foreign ships.