The House of York was a cadet branch of the English royal House of Plantagenet. Three of its members would become Kings of England in the late 15th century. The House of York was descended in the male line from Edmund of Langley, 1st Duke of York, the fourth surviving son of Edward III, but also represented Edward's senior line, being cognatic descendants of Lionel, Duke of Clarence, Edward III's second surviving son. It is based on these descents that they claimed the English crown. Compared with the House of Lancaster, it had a senior claim to the throne of England according to cognatic primogeniture but junior claim according to the agnatic primogeniture.

Edmund of Langley had two sons, Edward, and Richard of Conisburgh. Edward succeeded to the dukedom in 1402, but was killed at the battle of Agincourt in 1415, with no issue. His younger brother married Anne de Mortimer, a great-granddaughter of Lionel of Antwerp, the second son of Edward III. Anne was also heiress to the earldom of March, following the death of her brother Edmund, 5th Earl in 1425. Edmund Mortimer was the son of Roger Mortimer, 4th Earl of March, who had been named heir presumptive of Richard II, prior to the usurpation of the House of Lancaster, in the person of Henry Bolingbroke, in 1399.

York (local ⁱ/ˈjɔːk/) is a walled city, situated at the confluence of the Rivers Ouse and Foss in North Yorkshire, England. The city has a rich heritage and has provided the backdrop to major political events throughout much of its two millennia of existence. The city offers a wealth of historic attractions, of which York Minster is the most prominent, and a variety of cultural and sporting activities.

The city was founded by the Romans in 71 AD, under the name of Eboracum. It became in turn the capital of the Roman province of Britannia Inferior, and of the kingdoms of Northumbria and Jorvik. In the Middle Ages, York grew as a major wool trading centre and became the capital of the northern ecclesiastical province of the Church of England, a role it has retained.

In the 19th century York became a hub of the railway network and a confectionery manufacturing centre. In recent decades, the economy of York has moved from being dominated by its confectionery and railway-related industries to one that provides services. The University of York and health services have become major employers, whilst tourism has become an important element of the local economy.