Dalhousie Castle has seen much history. King Edward I (Longshanks) stayed at the castle on his way to meet Sir William Wallace at the Battle of Falkirk. In 1400, Sir Alexander Ramsay withstood a six-month siege at Dalhousie by English forces led by King Henry IV. Oliver Cromwell used the castle as a base for his invasion of Scotland. Many Earls of Dalhousie have taken an active part in British political and military leadership.