King Lot /ˈlɒt/, also spelled Loth or Lott (Lleu or Llew in Welsh), is a British monarch in Arthurian legend.

He has appeared regularly in works of chivalric romance, alternating between the roles of Arthur's enemy and ally, and is often depicted as the ruler of Lothian and either Norway or Orkney.

Lot is generally portrayed as the husband of Arthur's sister or half-sister known by many names but most often as Anna, Gwyar, or variants of Morgause.

[1] In this text, Leudonus has his daughter Teneu thrown from a cliff when he discovers that she had been raped and impregnated by Owain mab Urien.

Welsh sources refer to Leudonus as Lewdwn or Llewdwn Lluydauc ("L[l]ewdwn of the Host") and make him king of the Gododdin people in the region of Hen Ogledd.

Geoffrey of Monmouth seems to refer to this earlier figure in the king whom he called Lot or Loth in his early 12th-century manuscript Historia Regum Britanniae.

The Old Norwegian name Ljot was common in the Galte clan, who ruled Orkney and parts of Scotland before the Sinclairs.

Early Arthurian works of chivalric romance, such as those of Chrétien de Troyes, often refer to Lot, but he rarely receives more than a mention in connection to his son Gawain.

[11] De Ortu Waluuanii and Les Enfances Gauvain tell of how the teenage Lot fell in love with Uther Pendragon's young daughter Anna while serving as her page.

The story takes place during the time when he was a royal hostage at the court of Uther after the first British conquest of Norway.

He and Morgause have five sons: Gawain, Agravain, Gaheris, and Gareth, as well as Mordred (whose biological father is Arthur from an incestual relationship with his sister).

Arthur gathers up all babies born around that time, including his own illegitimate son, Mordred, and puts them on a rudderless boat that sinks, and the children are believed to have all died.