Lancaster Castle is a medieval castle

Castle

A castle is a type of fortified structure built in Europe and the Middle East during the Middle Ages by European nobility. Scholars debate the scope of the word castle, but usually consider it to be the private fortified residence of a lord or noble...

 located in Lancaster

Lancaster, Lancashire

Lancaster is the county town of Lancashire, England. It is situated on the River Lune and has a population of 45,952. Lancaster is a constituent settlement of the wider City of Lancaster, local government district which has a population of 133,914 and encompasses several outlying towns, including...

 in the English county of Lancashire

Lancashire

Lancashire is a non-metropolitan county of historic origin in the North West of England. It takes its name from the city of Lancaster, and is sometimes known as the County of Lancaster. Although Lancaster is still considered to be the county town, Lancashire County Council is based in Preston...

. Its early history is unclear, but may have been founded in the 11th century on the site of a Roman fort overlooking a crossing of the River Lune

River Lune

The River Lune is a river in Cumbria and Lancashire, England.It is formed at Wath, in the parish of Ravenstonedale, Cumbria, at the confluence of Sandwath Beck and Weasdale Beck...

. In 1164, the Honour of Lancaster, including the castle, came under royal control. In 1322 and 1389 the Scots invaded England, progressing as far as Lancaster and damaging the castle.