Now should the age of the fabric, decorated thus simply though judiciously, be questioned, it must be owned that there is nothing to indicate its being older than the fourteenth century. It is true that a western tower with no entrance from outside was a feature of many Saxon churches, but such towers continued to be built for parish churches until a late date. The rough masonry of the Grasmere tower is due to the material; and the massive boulders used in the foundation were no doubt gathered from the beck, whose proximity must have been highly convenient for builders who were poorly equipped for the quarrying of their slate rock. The "ogee" or trefoiled arch was a development of the Decorated style of architecture, which evolved the form from the elaborate traceries of its windows.[126] The Decorated style is roughly computated as lasting from the open to the close of the fourteenth century, and the period of its use coincides fairly with the time when our church fell under the influence of the monastery. [126] S. Holborne: _Architecture of European Religions_. A church of primitive size would be sufficient for the folk of the three townships, while they lived in scattered homesteads and were all bent upon husbandry, with short intervals of warfare with the Scots. But it would become too small for a growing population that throve in times of peace upon the wool trade.[127] With walk-mills in the valleys, and families growing rich as clothiers, some extension of the church would be necessary; and this extension seems to have been started in a fashion strangely simple. Leaving the walls of the edifice intact with its roof, a space almost equal--for it is but one yard narrower--was marked off on the northern side, enclosed by walls and roofed over. The intervening wall could not be removed, because the builders were incapable of spanning the double space by a single roof. It was therefore left to sustain the timbers of the two roofs, and through its thickness (over three feet) spaces were broken in the form of simple arches. Thus--though one is called an aisle--two naves were practically formed, separated by the pierced wall. The date of this enlargement is uncertain. If we place it in the era of the prosperity of the townships from the cloth trade, it could have been done no earlier than the reign of Henry the Seventh, and no later than the early days of Elizabeth; while a supposition that it was not taken in hand until the dissolution of the monastery had thrown the men of the three townships on their resources is strengthened by the character of the work. [127] See Fullers and Freeholders: _Trans. of Cumberland and Westmorland Ant. So._, N.S.