Richard, Duke of York in the context of "Act of Accord"

The Wars of the Roses, known at the time and in following centuries as the Civil Wars, and also the Cousins' War, were a series of armed confrontations, machinations, battles and campaigns fought for control of the English throne from 1455 to 1487. The conflict was fought between supporters of the House of Lancaster (emblem a red rose) and House of York (white rose), two rival cadet branches of the royal House of Plantagenet. The conflict resulted in the end of Lancaster's male line in 1471, leaving the Tudor family to inherit their claim to the throne through the female line. Conflict was largely brought to an end upon the union of the two houses through marriage, creating the Tudor dynasty that would subsequently rule England.

The Wars of the Roses were rooted in English socio-economic troubles caused by the Hundred Years' War (1337–1453) with France, as well as the quasi-military bastard feudalism resulting from the powerful duchies created by King Edward III. The mental instability of King Henry VI of the House of Lancaster revived his cousin Richard, Duke of York's interest in a claim to the throne. Warfare began in 1455 with York's capture of Henry at the First Battle of St Albans, upon which York was appointed Lord Protector by Parliament. Fighting resumed four years later when Yorkists led by Richard Neville, Earl of Warwick, captured Henry again at the Battle of Northampton. After attempting to seize the throne, York was killed at the Battle of Wakefield, and his son Edward inherited his claim per the controversial Act of Accord. The Yorkists lost custody of Henry in 1461 after the Second Battle of St Albans, but defeated the Lancastrians at the Battle of Towton. The Yorkist Edward was formally crowned in June 1461.

Richard Neville, 16th Earl of Warwick, 6th Earl of Salisbury, KG (22 November 1428 – 14 April 1471), known as Warwick the Kingmaker, was an English nobleman, administrator, landowner of the House of Neville fortune and military commander. The eldest son of Richard Neville, 5th Earl of Salisbury, he became Earl of Warwick through marriage, and was the wealthiest and most powerful English peer of his age, with political connections that went beyond the country's borders. One of the leaders in the Wars of the Roses, originally on the Yorkist side but later switching to the Lancastrian side, he was instrumental in the deposition of two kings, which led to his epithet of "Kingmaker".

Through fortunes of marriage and inheritance, Warwick emerged in the 1450s at the centre of English politics. Originally, he was a supporter of King Henry VI; however, a territorial dispute with Edmund Beaufort, Duke of Somerset, led him to collaborate with Richard, Duke of York, in opposing the king. From this conflict, he gained the strategically valuable post of Captain of Calais, a position that benefited him greatly in the years to come. The political conflict later turned into a full-scale rebellion, where in battle York was slain, as was Warwick's father Salisbury. York's son, however, later triumphed with Warwick's assistance and was crowned King Edward IV. Edward initially ruled with Warwick's support, but the two later fell out over foreign policy and the king's choice to marry Elizabeth Woodville. After a failed plot to crown Edward's brother, George, Duke of Clarence, Warwick instead restored Henry VI to the throne. The triumph was short-lived, however: on 14 April 1471, Warwick was defeated by Edward at the Battle of Barnet, and killed.

Edward IV (28 April 1442 – 9 April 1483) was King of England from 4 March 1461 to 3 October 1470, then again from 11 April 1471 until his death in 1483. He was a central figure in the Wars of the Roses, a series of civil wars in England fought between the Yorkist and Lancastrian factions between 1455 and 1487.

Edward inherited the Yorkist claim to the throne at the age of eighteen when his father, Richard, Duke of York, was killed at the Battle of Wakefield in December 1460. After defeating Lancastrian armies at Mortimer's Cross and Towton in early 1461, he deposed King Henry VI and took the throne. His marriage to Elizabeth Woodville in 1464 led to conflict with his chief advisor, Richard Neville, Earl of Warwick, known as the "Kingmaker". In 1470, a revolt led by Warwick and Edward's brother George, Duke of Clarence, briefly re-installed Henry VI. Edward fled to Flanders, where he gathered support and invaded England in March 1471; after victories at the battles of Barnet and Tewkesbury (where both the Earl of Warwick and Edward of Westminster, Prince of Wales, were killed), he resumed the throne. Shortly afterwards, Henry VI was found dead in the Tower of London, possibly killed on Edward's orders.

The First Battle of St Albans took place on 22 May 1455, at St Albans, 22 miles (35 km) north of London, and traditionally marks the beginning of the Wars of the Roses in England. Richard, Duke of York, and his allies, the Neville Earls of Salisbury and Warwick, defeated a royal army commanded by Edmund Beaufort, Duke of Somerset. Unusually, the battle was contested in the town of St Albans itself, with the bulk of the fighting taking place inthe streets and a tavern being used as a redoubt. Somerset was killed in the battle, and King Henry VI captured, clearing the way for a subsequent parliament to appoint Richard of York Lord Protector.

The Battle of Towton took place on 29 March 1461 during the Wars of the Roses, near Towton in North Yorkshire. Yorkist forces decisively defeated Lancastrian supporters of Henry VI, securing the English throne for Edward IV. Fought for ten hours between an estimated 50,000 soldiers from both sides in a snowstorm on Palm Sunday, it was "probably the largest and bloodiest battle on English soil".

Henry VI succeeded his father, Henry V, when he was nine months old in 1422, but was a weak, ineffectual and mentally unsound ruler, which encouraged the nobles to scheme for control over him. The situation deteriorated in the 1450s into a civil war between his Beaufort relatives and his wife, Queen Margaret, on one side, with those of his cousin Richard, Duke of York, on the other.

Edmund Beaufort, 2nd Duke of Somerset, 4th Earl of Somerset, 1st Earl of Dorset, 1st Marquess of Dorset styled 1st Count of Mortain, (1406 – 22 May 1455), was an English nobleman and an important figure during the Hundred Years' War. His rivalry with Richard, Duke of York, was a leading cause of the Wars of the Roses.