Andrew Harclay, 1st Earl of Carlisle, alternatively Andreas de Harcla, was an important English military leader in the borderlands with Scotland during the reign of Edward II. Coming from a knightly family in Westmorland, he was appointed sheriff of Cumberland in 1311. He distinguished himself in the Scottish Wars, and in 1315 repulsed a siege on Carlisle Castle by Robert the Bruce. Shortly after this, he was taken captive by the Scots, and only released after a substantial ransom had been paid. His greatest achievement came in 1322, when he defeated the rebellious baron Thomas of Lancaster at the Battle of Boroughbridge on 16–17 March. For this he was created Earl of Carlisle.

Edward II, also known as Edward of Caernarfon or Caernarvon, was King of England from 1307 until he was deposed in January 1327. The fourth son of Edward I, Edward became the heir to the throne following the death of his older brother Alphonso. Beginning in 1300, Edward accompanied his father on campaigns in Scotland, and in 1306 he was knighted in a grand ceremony at Westminster Abbey. Edward succeeded to the throne the next year, following his father's death. In 1308, he married Isabella of France, the daughter of the powerful King Philip IV, as part of a long-running effort to resolve the tensions between the English and French crowns.