§ 12. Pluralism and litigation, in themselves, had no noticeable effect on architectural development. But they led to a desire, on the part of the parishioners, for resident clergy with an endowment independent of the caprices of lay patrons. And this led to the establishment of chantry priests at the altars of churches, which had a powerful effect upon the architectural growth of the churches in which they served. Towards the end of the thirteenth century, and from that time to the Reformation, the foundation of chantries in parish churches became a common thing. Zeal for the foundation of monasteries had spent itself. Lay benefactors acquired the habit of alienating land, not to some religious house, but to one or more priests who, as a condition of the gift, should say mass daily at one of the altars of a parish church for the good estate of the giver and other persons named by him, and for their souls after death. These endowments of services were known as chantries, and were intended to continue for ever. Many chantries were founded in cathedral and monastery churches; but, as time went on, the church of the parish in which the benefactor lived was more and more frequently chosen as their site. That this had been always the custom is probable; but it was a custom which certainly was not universal until the later middle ages. From the time of the enactment of the statute of mortmain, we possess a series of royal licences for the foundation of chantries and gifts of land to chantry priests, which are invaluable in tracing the history of the English parish church. A chantry, however, is a service, not the building in which it is held. It might be founded at the high altar of a church, but more usually was connected with one of the lesser altars. It was natural, however, that a founder would be willing to do something for the repair of the part of the church in which his chantry was held. Repair took the form of enlargement and rebuilding; and while special chantry chapels were sometimes built as excrescences from the main body of the church, the usual building which was done in connexion with a chantry implied the widening or addition of an aisle.