The old maps shew a piece of water on the Steine, between the Castle Tavern and the Pavilion, formed by the spring which rose at Patcham and used to flow by the Pool—Pool Valley. In the year 1793, the Prince of Wales and the Duke of Marlborough, whose house stood at the north end of the Marine Pavilion, made an arched sewer along the Steine, to carry away this water into the sea, and, in consideration of the expense and improvement, the Lords of the Manor, with consent of the homage, gave his Royal Highness and the Duke permission to rail in or enclose a certain portion of the Steine, adjoining their houses respectively, but never to build on or encumber it with any thing that might obstruct the prospect, or in any other way be a nuisance to the Steine. A barn which stood at this spot, the property of Mr. Howell, as shewn in the view of the Steine, 1765, was moved, at the request of the Prince of Wales, to the top of Church Street, into the field whereon also stood the Infantry Barracks Hospital, a wooden building that occupied the site of the Hanover Chapel Burial Ground. There were two main entrances to the sewer. One was about the centre of the road,—along which the water channel ran,—opposite the Pavilion Parade; and the other was in the roadway immediately to the east of the entrance to Castle Square from the Steine. Each was protected by a wooden railing in a triangular form. The sewer discharged itself by means of a square wooden trunk at the back of Williams’s Baths, now the south front of the Lion Mansion. In 1785–6, the first houses on the South Parade, the east side of the Steine south of St. James’s Street, began to be erected, and in a few years the whole of them, as well as the extensive range of buildings which forms the North Parade, were completed.