Pontefract. Clark, ii. 375-88.
—— Hartshorne, C. H., Journal British Archaeol. Assoc., xx. 136-55).
Porchester. Clark, ii. 388-400.
Prudhoe. Bates, Border Holds.
Raby. Scott, O. S., Raby, its Castle and its Lords. Barnard Castle, 1908.
Raglan. Beattie, W. (Jour. Archaeol. Assoc., ix. 215-30).
—— Bradney, J. A. (Bristol and Glouc. Archaeol. Soc., xx. 76-87).
Richmond. Clark (Yorkshire Archæol. Journal, ix. 33-54).
—— Curwen, J. F., (Cumberland and Westmorland Antiq. and Archaeol. Soc., vi. 326-32).
—— Yorks Archæol. Journal, xx. 132-3.