Despenser War: A royalist army defeated troops loyal to Thomas, 2nd Earl of Lancaster, in the Battle of Boroughbridge, which allowed King Edward II of England to hold on to power for another five years.

The Despenser War (1321–22) was a baronial revolt against Edward II of England led by the Marcher Lords Roger Mortimer and Humphrey de Bohun. The rebellion was fuelled by opposition to Hugh Despenser the Younger, the royal favourite. After the rebels' summer campaign of 1321, Edward was able to take advantage of a temporary peace to rally more support and a successful winter campaign in southern Wales, culminating in royal victory at the Battle of Boroughbridge in the north of England in March 1322. Edward's response to victory was his increasingly harsh rule until his fall from power in 1326.

Thomas, 2nd Earl of Lancaster was an English nobleman of the first House of Lancaster of the royal Plantagenet Dynasty. He was Earl of Lancaster, Leicester, and Derby from 1296 to 1322, and Earl of Lincoln and Salisbury jure uxoris from 1311 to 1322. As one of the most powerful barons of England, Thomas was one of the leaders of the baronial opposition to his first cousin, King Edward II.

The Battle of Boroughbridge was fought on 16 March 1322 in England between a group of rebellious barons and the forces of King Edward II, near Boroughbridge, north-west of York. The culmination of a long period of antagonism between the King and Thomas, Earl of Lancaster, his most powerful subject, it resulted in Lancaster's defeat and execution, ending the Despenser War. This allowed Edward to re-establish royal authority and hold on to power for almost five more years.

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, daughter of the powerful King Philip IV of France, as part of a long-running effort to resolve the tensions between the English and French crowns.