Derwentwater House is first recorded in 1679 and was amongst property forfeited to the Crown in 1716 when the 2nd Earl of Derwentwater was executed for treaason; it was described as the slate house. The house eventually came into the possession of the Duke of Northumberland in 1778. An 18th century painting (Alnwick Castle from the Town, 1781 by John Bromley), in Alnwick Castle depicts part of the house, and shows a lower gabled building with two storeys and a dormer attic, mullioned-and-transomed windows with hood moulds and, possibly, a pantiled roof. It is thought to have been demolished before 1797 when Bailiffgate House (No 2 Bailiffgate) was built; more recently No 2 Bailiffgate has sometimes been referred to as Derwentwater House. (1)