Alnwick Castle (ˈænɪk) is a castle and country house in Alnwick in the English county of Northumberland. It is the seat of the 12th Duke of Northumberland, built following the Norman conquest and renovated and remodelled a number of times. It is a Grade I listed building now the home of Ralph Percy, 12th Duke of Northumberland and his family. In 2016, the castle received over 600,000 visitors per year when combined with adjacent attraction the Alnwick Garden.
Alnwick Castle guards a road crossing the River Aln. Ivo de Vesci, Baron of Alnwick, erected the first parts of the castle in about 1096. Beatrix de Vesci, the daughter of Yves de Vescy, married the Constable of Chestershire and Knaresborough, Eustace fitz John. By his marriage to Beatrix de Vesci he gained the baronies of Malton and Alnwick. The castle was first mentioned in 1136 when it was captured by King David I of Scotland. At this point it was described as "very strong". It was