Either through the missionary works of Roman or Byzantine monks, local remnants of the Romanized people or the Byzantine population in the cities, the Christianization of the Serbs appears to be peaceful and voluntary, unlike the forceful practices of the Frankish Empire. Apart from the political implications - use of new religion for the strengthening of the central rule and concentration of the power in the hands of the ruler - there was also a cultural and spiritual dimension, which included acceptance of the basic cultural values and principles of the day, and the church was the founding stone of literacy and education in the Middle Age societies. The entire religious-cultural process spanned through three centuries.