William the Conqueror in the context of "Windsor Castle"

An epithet (from Ancient Greek ἐπίθετον (epítheton) 'adjective', from ἐπίθετος (epíthetos) 'additional'), also a byname, is a descriptive term (word or phrase) commonly accompanying or occurring in place of the name of a real or fictitious person, place, or thing. It is usually literally descriptive, as in Alfred the Great, Suleiman the Magnificent, Richard the Lionheart, and Ladislaus the Short, or allusive, as in Edward the Confessor, William the Conqueror, Æthelred the Unready, John Lackland, Mehmed the Conqueror and Bloody Mary.

The word epithet also may refer to an abusive, defamatory, or derogatory word or phrase. This use is criticized by Martin Manser and other proponents of linguistic prescription. H. W. Fowler noted in 1926 that "epithet is suffering a vulgarization that is giving it an abusive imputation".

Edward the Confessor (c. 1003 – 5 January 1066) was King of the English from 1042 until his death in 1066. He was the last reigning monarch of the House of Wessex.

Edward was the son of Æthelred the Unready and Emma of Normandy. He succeeded Cnut the Great's son – and his own half-brother – Harthacnut. He restored the rule of the House of Wessex after the period of Danish rule since Cnut conquered England in 1016. When Edward died in 1066, he was succeeded by his brother-in-law Harold Godwinson, who was defeated and killed in the same year at the Battle of Hastings by the Normans under William the Conqueror. Edward's young great-nephew Edgar Ætheling of the House of Wessex was proclaimed king after the Battle of Hastings, but was never crowned and was peacefully deposed after about eight weeks.

The Norman Conquest of England (or the Conquest) was an 11th-century invasion by an army made up of thousands of Norman, French, Flemish, and Breton troops, all led by the Duke of Normandy, later styled William the Conqueror.

William's claim to the English throne derived from his familial relationship with the childless Anglo-Saxon king Edward the Confessor, who may have encouraged William's hopes for the throne. Edward died in January 1066 and was succeeded by his brother-in-law Harold Godwinson. The Norwegian king Harald Hardrada invaded northern England in September 1066 and was victorious at the Battle of Fulford on 20 September, but Godwinson's army defeated and killed Hardrada at the Battle of Stamford Bridge on 25 September. Three days later on 28 September, William's invasion force of thousands of men and hundreds of ships landed at Pevensey in Sussex in southern England. Harold marched south to oppose him, leaving a significant portion of his army in the north. Harold's army confronted William's invaders on 14 October at the Battle of Hastings. William's force defeated Harold, who was killed in the engagement, and William became king.

The Bayeux Tapestry is an embroidered cloth nearly 70 metres (230 feet) long and 50 centimetres (20 inches) tall that depicts the events leading up to the Norman Conquest of England in 1066, led by William, Duke of Normandy, challenging Harold II, King of England, and culminating in the Battle of Hastings. It is thought to date to the 11th century, within a few years of the battle. Now widely accepted to have been made in England, perhaps as a gift for William, it tells the story from the point of view of the conquering Normans and for centuries has been preserved in Normandy.

According to Sylvette Lemagnen, conservator of the tapestry, in her 2005 book La Tapisserie de Bayeux:

An overlord in the English feudal system was a lord of a manor who had subinfeudated a particular manor, estate or fee, to a tenant. The tenant thenceforth owed to the overlord one of a variety of services, usually military service or serjeanty, depending on which form of tenure (i.e. feudal tenancy contract) the estate was held under. The highest overlord of all, or lord paramount, was the monarch, who due to his ancestor William the Conqueror's personal conquest of the Kingdom of England, owned by inheritance from him all the land in England under allodial title and had no superior overlord, "holding from God and his sword", although certain monarchs, notably King John (1199–1216) purported to grant the Kingdom of England to Pope Innocent III, who would thus have become overlord to English monarchs.

A paramount lord may then be seen to occupy the apex of the feudal pyramid, or the root of the feudal tree, and such allodial title is also termed "radical title" (from Latin radix, root), "ultimate title" and "final title". William the Conqueror immediately set about granting tenancies on his newly won lands, in accordance with feudal principles. The monarch's immediate tenants were the tenants-in-chief, usually military magnates, who held the highest status in feudal society below the monarch. The tenants-in-chief usually held multiple manors or other estates from the monarch, often as feudal barons (or "barons by tenure") who owed their royal overlord an enhanced and onerous form of military service, and subinfeudated most to tenants, generally their own knights or military followers, keeping only a few in demesne. This created a mesne lord – tenant relationship. The knights in turn subinfeudated to their own tenants, creating a further subsidiary mesne lord – tenant relationship. Over the centuries for any single estate the process was in practice repeated numerous times.

The House of Wessex, also known as the House of Cerdic, the House of the West Saxons, the House of the Gewisse, the Cerdicings and the West Saxon dynasty, refers to the family, traditionally founded by Cerdic of the Gewisse, that ruled Wessex in Southern England from the early 6th century. The house became dominant in southern England after the accession of King Ecgberht in 802. Alfred the Great saved England from Viking conquest in the late ninth century and his grandson Æthelstan became first king of England in 927. The disastrous reign of Æthelred the Unready ended in Danish conquest in 1014. Æthelred and his son Edmund Ironside attempted to resist the Vikings in 1016, but after their deaths the Danish Cnut the Great and his sons ruled until 1042. The House of Wessex then briefly regained power under Æthelred's son Edward the Confessor, but lost it after the Confessor's reign, with the Norman Conquest in 1066. All monarchs of England (and subsequently Great Britain) since William II have been descended from the House of Wessex through William the Conqueror's wife Matilda of Flanders, who was a descendant of Alfred the Great through his daughter Ælfthryth. All English and later British monarchs since Henry II are descended from the English kings of the House of Wessex through Henry I's wife, Matilda of Scotland, daughter of Margaret of Wessex, a great-granddaughter of Edmund Ironside.

Harold Godwinson (died 14 October 1066), also called Harold II, was the last crowned Anglo-Saxon king of England. Harold reigned from 6 January 1066 until his death at the Battle of Hastings on 14 October 1066, the decisive battle of the Norman Conquest. He was succeeded by William the Conqueror, the victor at Hastings.

Harold Godwinson was a member of the most powerful noble family in England, his father Godwin having been made earl of Wessex by King Cnut the Great. Harold, who served previously as earl of East Anglia, was appointed to his father's earldom on Godwin's death. After his brother-in-law, King Edward the Confessor, died childless on 5 January 1066, the Witenagemot convened and chose Harold to succeed him; he was probably the first English monarch to be crowned in Westminster Abbey. In late September, he defeated an invasion by rival claimant Harald Hardrada of Norway in the Battle of Stamford Bridge near York before marching his army back south to meet William at Hastings two weeks later, where he was killed in battle.

The Battle of Hastings was fought on 14 October 1066 between the Norman-French army of William, Duke of Normandy, and an English army under the Anglo-Saxon King Harold Godwinson, beginning the Norman Conquest of England. It took place approximately 7 mi (11 km) northwest of Hastings, close to the present-day town of Battle, East Sussex, and was a decisive Norman victory.

The background to the battle was the death of the childless King Edward the Confessor in January 1066, which set up a succession struggle between several claimants to his throne. Harold was crowned king shortly after Edward's death but faced invasions by William, his own brother Tostig, and the Norwegian king Harald Hardrada (Harold III of Norway). Hardrada and Tostig defeated a hastily gathered army of Englishmen at the Battle of Fulford on 20 September 1066. They were in turn defeated by Harold at the Battle of Stamford Bridge on 25 September. The deaths of Tostig and Hardrada at Stamford Bridge left William as Harold's only serious opponent. While Harold and his forces were recovering, William landed his invasion forces in the south of England at Pevensey on 28 September and established a beachhead for his conquest of the kingdom. Harold was forced to march south swiftly, gathering forces as he went.

Robert Curthose (c. 1051 – c.3 February 1134, French: Robert Courteheuse), the eldest son of William the Conqueror, was Duke of Normandy as Robert II from 1087 to 1106.

Robert was also an unsuccessful pretender to the throne of the Kingdom of England. The epithet "Curthose" originated in the Norman French word courtheuse ("short stockings"). The chroniclers William of Malmesbury and Orderic Vitalis wrote that his father had derisively called him brevis-ocrea ("short boot").