Lot in Arthurian Legend was the king of Lothian, Orkney, and Norway which leads to his name which essentially means "King of Lothian". He is the father of most popularly Gawain, Gareth, and in Welsh tradition, Mordred. His wife was the sister of King Arthur and is variously named Morgause and Anna. He is variously cited as already being a king on Arthur's side, as a rebel King against Arthur, and as Arthur's page who was later raised to King of Norway.

Lot's mistaken kingship of Orkney is due to confusion between himself and a son of Thorfinn Skull-Splitter named Liot , who was Jarl of Orkney in the late 10th century. This confusion doubtlessly has something to do with the Norway connection as well.

Historically speaking, Lot Luwddoc (Lot of the Host) is the Arthurian king who married Anna (better known as Morgause, the sister or half-sister of King Arthur), and was father to Gawain. Lot was descended from a chief by the name of Caractacus, who led the Catuvellauni tribe of pre-Roman Britain.

In Celtic Myths and Legends (Gresham 1912, page 359 as republished by Paragon 1998, ISBN 0752526766) Charles Squire identified Lot as a late incarnation of a British god who is remembered in medieval Welsh legend as Lludd .

See also:

• List of Arthurian Characters
• The Stone Lud