Following the 1st Duke’s death the Duchess concentrated most of her considerable energies on the completion of the palace itself, and the park remained relatively unchanged until the arrival of Capability Brown in 1764. The 4th Duke employed Brown who immediately began an English landscape garden scheme to naturalise and enhance the landscape, with tree planting, and man-made undulations. However, the feature with which he is forever associated is the lake, a huge stretch of water created by damming the River Glyme and ornamented by a series of cascades where the river flows in and out. The lake was narrowed at the point of Vanbrugh’s grand bridge, but the three small canal-like streams trickling underneath it were completely absorbed by one river-like stretch. Brown’s great achievement at this point was to actually flood and submerge beneath the water level the lower stories and rooms of the bridge itself, thus reducing its incongruous height and achieving what is regarded by many as the epitome of an English landscape. Brown also grassed over the great parterre and the Great Court. The latter was re-paved by Duchêne in the early 20th century. The 5th Duke was responsible for several other garden follies and novelties.