Black Douglas refers to Sir James Douglas, a prominent Scottish knight and military leader during the late 13th and early 14th centuries. He was a loyal supporter of Robert the Bruce, the King of Scotland, and played a crucial role in the Wars of Scottish Independence against England. Douglas earned his nickname due to his dark hair and armor, and he became known for his bravery and tactical skills in battle. One of his most famous exploits was the raid into England, where he carried the heart of Robert the Bruce into battle after the king's death. Douglas's legacy is celebrated in Scottish history, symbolizing courage and loyalty in the fight for Scotland's freedom.