Windsor Castle is located in Berkshire, England, and was built as a motte and bailey castle by William the Conqueror (r. 1066-1087). Converted into stone by Henry II of England (r. 1165-1179), the shell keep tower was rebuilt by Edward III of England (r. 1327-1377). The castle was then added to and modified many times over the centuries.
This is a companion discussion topic for the original content at https://www.worldhistory.org/Windsor_Castle/.