Siward's Howe, also known as Heslington Hill or Bunny Hill, is a terminal moraine located to the south-east of the city of York. The howe is situated north west of the Morrell Library building of the University of York. The southern side of the howe is part of Alcuin college of the University of York. Its imposing water tower is visible from many parts of the nearby suburbs of Tang Hall and Osbaldwick. 
Howe, when derived from the Old Norse: haugr, means hill, knoll, or mound and may refer to a tumulus, or barrow. Siward's Howe is named for Siward, Earl of Northumbria, the 11th-century Danish warrior. He was romanticised in the William Shakespeare play, The Tragedy of Macbeth. Siward died at York during 1055 and is rumoured to have been buried beneath the tumuli at the wooded summit. 
- "Siwards How, south east of the water tower, Heslington Hill". Historic England. January 1997. Retrieved May 1, 2018.
- Eric Partridge (1977) Origins: A Short Etymological Dictionary of Modern English (Routledge) ISBN 0203421140
- Archaeological Evaluation. Heslington Hill. Heslington York. (University of York. January 1997)
- Aird, William M. (2004) Siward, earl of Northumbria (d. 1055), magnate (Oxford Dictionary of National Biography)
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