We may also note here that when a bishop's official seat or throne (cathedra) was placed in a church, it thereby became a cathedral church. Sometimes the cathedral church was a monastic church, sometimes a collegiate church; in each case the church was known as a cathedral. From the standpoint of the development of education, as will be subsequently shown, the distinction between a collegiate cathedral church and a monastic cathedral church is an important one, but this distinction cannot always be clearly made, because during the early centuries of Christianity in England, a cathedral church was at times in the possession of the regular clergy, and at other times in the hands of the secular clergy. Thus Christ Church, Canterbury, was originally monastic but is said to have fallen into the hands of the seculars during the archiepiscopate of Ceolnoth (837-870), after which it again returned to the monks and remained monastic till the Reformation. So too, Gloucester Cathedral was originally monastic, then Offa transferred it to the secular clergy, later it again became monastic. Whether or not the cathedral church of a diocese was monastic, the bishop of a diocese was the head of the secular clergy and obedience was due to him from them; on the other hand, the monks owed their obedience directly to their abbot, from him to the head of their order, and ultimately to the pope.[44] In this chapter we propose to limit ourselves to the labours for education of the bishop and the secular clergy, though, as we have previously indicated, the line of demarcation between the work that was definitely monastic and that which may definitely be assigned to the secular clergy cannot always be clearly drawn. The educational problems which had to be faced by a bishop and his band of secular priests were similar to those which had to be dealt with by the missionary monks. Latin, the language of the Church, had to be taught to those who were ignorant of it and who wished to be attached to the Church in an official capacity. A knowledge of music was necessary for those who desired to take a personal part in the worship offered by the Church. In addition, the principles of Christianity had to be taught more fully to converts; the children of the faith required instruction; arrangements had to be made for more advanced instruction for those who were desirous of receiving it. Schools had to be founded for these purposes, and these schools were the original schools of England. We have already adopted as our hypothesis that the schools of this country were not a new discovery but were modelled on those which existed elsewhere. Our first problem consequently, is to discover where these models were found.