House of Beaufort in the context of Henry Beaufort

The House of Tudor (/ˈtjuː.dər/, TEW-dər) was an English and Welsh dynasty that held the throne of England from 1485 to 1603. They descended ultimately from Ednyfed Fychan and the Tudors of Penmynydd, a Welsh noble family, and Catherine of Valois. The Tudor monarchs were also descended from the House of Lancaster. They ruled the Kingdom of England and the Lordship of Ireland (later the Kingdom of Ireland) for 118 years with five monarchs: Henry VII, Henry VIII, Edward VI, Mary I and Elizabeth I. The Tudors succeeded the House of Plantagenet as rulers of the Kingdom of England, and were succeeded by the Scottish House of Stuart. The first Tudor monarch, Henry VII, descended through his mother from the House of Beaufort, a legitimised branch of the English royal House of Lancaster, a cadet house of the Plantagenets. The Tudor family rose to power and started the Tudor period in the wake of the Wars of the Roses (1455–1487), which left the main House of Lancaster (with which the Tudors were aligned) extinct in the male line.

Henry VII (a descendant of Edward III, and the son of Edmund Tudor, a half-brother of Henry VI) succeeded in presenting himself as a candidate not only for traditional Lancastrian supporters, but also for discontented supporters of their rival Plantagenet cadet House of York, and he took the throne by right of conquest. Following his victory at the Battle of Bosworth Field (22 August 1485), he reinforced his position in 1486 by fulfilling his 1483 vow to marry Elizabeth of York, daughter of King Edward IV and the heiress of the Yorkist claim to the throne, thus symbolically uniting the former warring factions of Lancaster and York under the new dynasty (represented by the Tudor rose). The Tudors extended their power beyond modern England, achieving the full union of England and the Principality of Wales in 1542 (Laws in Wales Acts 1535 and 1542), and successfully asserting English authority over the Kingdom of Ireland (proclaimed by the Crown of Ireland Act 1542). They also maintained the nominal English claim to the Kingdom of France; although none of them made substance of it, Henry VIII fought wars with France primarily as a matter of international alliances but also asserting claim to the title. After him, his daughter Mary I lost control of all territory in France permanently with the Siege of Calais in 1558.

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.

Duke of Somerset, from the county of Somerset, is a hereditary title that has been created five times in the Peerage of England. It is particularly associated with two families: the Beauforts, who held the title from the creation of 1448, and the Seymours, from the creation of 1547, in whose name the title is still held. The present dukedom is unique, in that the first holder of the title created it for himself in his capacity of Lord Protector of the Kingdom of England, using a power granted in the will of his brother in law King Henry VIII.

The only subsidiary title of the current duke of Somerset is Baron Seymour of Trowbridge, which is used as a courtesy title by the eldest son and heir of the duke. This courtesy title is the lowest in rank of all heirs to dukedoms in the peerages of the British Isles, yet the holder's precedence is higher than his title suggests, by virtue of the seniority of the Dukedom of Somerset (the only more senior non-royal duke is the Duke of Norfolk).

In heraldry, an ordinary componée (anciently gobonnée), anglicised to compony and gobony, is composed of a row of squares, rectangles or other quadrilaterals, of alternating tinctures, often found as a bordure, most notably in the arms of the English House of Beaufort.

Like a baton sinister, a bordure compony can be used as a difference to delineate cadency and often indicates an illegitimate son, acknowledged but legally barred from inheritance of the feudal estates of his father. The first Earl of Somerset was later legitimized (allowed to inherit the feudal estates) by an act of Parliament, yet retained his original arms as also displayed by his legitimate descendants.