Lancelot-Grail in the context of "Perceforest"

Guinevere (/ˈɡwɪnəvɪər/ GWIN-ə-veer; Welsh: Gwenhwyfar pronunciation; Breton: Gwenivar, Cornish: Gwynnever), also often written in Modern English as Guenevere or Guenever, was, according to Arthurian legend, an early-medieval queen of Great Britain and the wife of King Arthur. First mentioned in literature in the early 12th century, nearly 700 years after the purported times of Arthur, Guinevere has since been portrayed as everything from a fatally flawed, villainous, and opportunistic traitor to a noble and virtuous lady. The variably told motif of abduction of Guinevere, or of her being rescued from some other peril, features recurrently and prominently in many versions of the legend.

The earliest datable appearance of Guinevere is in Geoffrey of Monmouth's pseudo-historical British chronicle Historia Regum Britanniae, in which she is seduced by Mordred during his ill-fated rebellion against Arthur. In a later medieval Arthurian romance tradition from France, a major story arc is the queen's tragic love affair with her husband's best knight and trusted friend, Lancelot, indirectly causing the death of Arthur and the downfall of the kingdom. This concept had originally appeared in nascent form in Chrétien de Troyes's poem Lancelot, the Knight of the Cart prior to its vast expansion in the prose cycle Lancelot-Grail, consequently forming much of the narrative core of Thomas Malory's seminal English compilation Le Morte d'Arthur. Other themes found in Malory and other texts include Guinevere's usual barrenness, the scheme of Guinevere's evil twin to replace her, and the particular hostility displayed towards Guinevere by her sister-in-law Morgan.

Morgan le Fay (/ˈmɔːrɡən lə ˈfeɪ/; Welsh and Cornish: Morgen; with le Fay meaning the fairy or the fae in Middle French, thus meaning 'Morgan the Fairy'), alternatively known as Morgan[n]a, Morgain[a/e], Morgant[e], Morg[a]ne, Morgayn[e], Morgein[e], and Morgue[in] among other names and spellings, is a powerful and ambiguous enchantress from the legend of King Arthur, in which most often she and he are siblings. Early appearances of Morgan in Arthurian literature do not elaborate her character beyond her role as a goddess, a fay, a witch, or a sorceress, generally benevolent and connected to Arthur as his magical saviour and protector. Her prominence increased as the legend of Arthur developed over time, as did her moral ambivalence, and in some texts there is an evolutionary transformation of her to an antagonist, particularly as portrayed in cyclical prose such as the Lancelot-Grail and the Post-Vulgate Cycle. A significant aspect in many of Morgan's medieval and later iterations is the unpredictable duality of her nature, with potential for both good and evil.

Her character may have originated from Welsh mythology as well as from other ancient and medieval myths and historical figures. The earliest documented account, by Geoffrey of Monmouth in Vita Merlini (written c. 1150) refers to Morgan in association with the Isle of Apples (Avalon), to which Arthur was carried after having been fatally wounded at the Battle of Camlann, as the leader of the nine magical sisters unrelated to Arthur. Therein, and in the early chivalric romances by Chrétien de Troyes and others, Morgan's chief role is that of a great healer. Several of numerous and often unnamed fairy-mistress and maiden-temptress characters found through the Arthurian romance genre may also be considered as appearances of Morgan in her different aspects.

Galehaut (or Galaha[l/u]t, Galeho[l/u]t, Gallehau[l]t, Galhault, Galeotto, et al.) is a half-giant knight and sovereign prince in the Arthurian legend. He is most prominent within the Lancelot-Grail prose cycle where he is a noble enemy turned an ally of King Arthur as well as an inseparable friend (and possible lover, according to some interpretations) of Arthur's champion Lancelot. He should not be mistaken with Lancelot's son, Galahad (which is also Lancelot's own birth name), and some other similarly named characters.

Camelot is a legendary castle and court associated with King Arthur. Absent in the early Arthurian material, Camelot first appeared in 12th-century French romances and, since the Lancelot-Grail cycle, eventually came to be described as the fantastic capital of Arthur's realm and a symbol of the Arthurian world.

Medieval texts locate it somewhere in Great Britain and sometimes associate it with real cities, though more usually its precise location is not revealed. Most scholars regard it as being entirely fictional, its unspecified geography being perfect for chivalric romance writers. Nevertheless, arguments about the location of the "real Camelot" have occurred since the 15th century and continue today in popular works and for tourism purposes.