In the medieval period the Church was the centre of both public and private life. Bishops and abbots were as wealthy as kings and princes and often better educated. The administration of the Church developed fast during this period, with stricter diocese (the district under the care of a bishop) and parish boundaries and the collection of tithes (one tenth of their income) from the faithful.
Prior to Norman and English involvement in Wales, the Welsh Church had been Celtic. However, the new ruling classes brought the Roman Church to Wales and Welsh bishops came more firmly under the authority of Canterbury and Rome. Ecclesiastical connections abroad also intensified and religious orders such as the Benedictines, Augustinians and Cistercians from continental Europe established monasteries in Wales.
In the 14th century the power of the English throne grew and Welsh-speaking members of the clergy were often eased out in favour of English clerics. In response to the increasing English repression there was great unrest in Wales and on the borders and both church and state were attacked. Subsequently, in the 15th century, with English authority reinstated, there was much rebuilding of churches to repair the devastation.

