Even the principal doors of a house were restricted in size, and were generally in one sheet, not divided down the middle and hung on either hand. The commonest form of fastening was a stout oak bar, which when out of use was pushed back into a long recess in the wall, and when wanted was drawn across the door far enough for its end to fit into a shallow recess in the opposite jamb. [Illustration: 51. Doorways. (_a_) From Prebendal House, Nassington, Northamptonshire. (_b_) Doorway (right) and Window (left), Rochester Castle, Kent (_c._ 1130).] [Illustration: 52. Hedingham Castle, Essex. Entrance Doorway, with grooves for portcullis.] [Illustration: 53. Hedingham Castle. (_cir._ 1130). Archway from Stairs to Gallery.] Early doorways are usually round-headed; sometimes the sweep of the arch was not fully semicircular but segmental. In important buildings like Rochester Castle and Hedingham, the arches were either of several orders or were richly ornamented with the zigzag or spiral mouldings characteristic of the period (Figs. 51, 52, 53). In houses of less importance, such as the prebendal house at Nassington, the treatment was simpler (Fig. 51_a_). In this case, although the arch is round, the label terminations show it to be of somewhat later date, probably early in the thirteenth century, or nearly a hundred years after those at Rochester and Hedingham. [Illustration: 54. Aydon Castle, Northumberland (_cir._ 1280). Doorway to Hall.] [Illustration: 55. Bishop’s Palace, Mayfield, Sussex. Doorway to Hall (early 14th cent.)] [Illustration: 56. Northborough Manor House, Northamptonshire. Doorways in the Screens (mid. 14th cent.).] [Illustration: 57. (_a_) Norrington Wilts (late 14th cent.). (_b_) Eltham Palace, Kent (15th cent.). (_c_) Lenham, Kent (late 15th cent.). (_d_) Lacock, Wiltshire; from the Angel Inn (early 16th cent.).] [Illustration: 58. Doorway from Harrietsham, Kent (late 15th cent.).]