was intended to legitimise and assert the post-conquest regime in England. Site Existing topographical and built features delineate the Priory precinct. The precinct comprises a rough quadrilateral of land about 16.1 hectares in area, 520 metres in width, west to east, and 310 metres north to south bounded along the north side by today's Southover High Street and Priory Street. This precinct was comparable in extent to the walled town of Lewes sited on the ridge to the north. The original context and relationship of the precinct to the natural topography is now far from clear because the tidal valley of the River Ouse to the south has been drained. In the mediaeval period the south side of the precinct addressed the Cockshut Stream and from there a navigable, tidal watercourse connecting to the River Ouse and, hence, the English Channel. The site can properly be understood as a coastal location and was fully enclosed by high flint walls, being vulnerable to sea-borne attack. The Priory buildings were constructed in the western half, the major church and sacred buildings being in the north-west quadrant. The precinct was terraced in section, stepping down to the south with the buildings set at different levels. The north-east quadrant has an embankment and wall enclosing its southern side that is of mediaeval date with semicircular buttresses along its eastern extent. This southern wall is a remarkable feature of a defensive, military character. This quadrant is a triple square on plan, the eastern half centres on the conical 'Mount', 46m (150 feet) in diameter and 15m (50 feet) high that is aligned on a sunken field to its east with banks on all sides known as the 'Dripping Pan'. The ages and original functions of these two man-made features are not certain: they appear to have been built by the Priory and may have been constructed as a salt works on an earlier enclosed. elevated plot. If of mediaeval date or earlier, the Mount would certainly have provided an observatory over the Ouse basin, of defensive importance, and a beacon to shipping navigating across it. Buildings Modern understanding of the layout and development of the Priory derives largely from archaeological excavations carried out since the 1840s, most extensively by George Somers Clarke. The accepted plan of the Priory was drawn by archaeologist and antiquary Sir William Henry St. John Hope and architect Sir Harold Brakspear