Lot or Loth is the eponymous king of Lothian in the Arthurian legend. He is best known as the father of Sir Gawain. Such a ruler first appeared late in the 1st millennium's hagiographical material concerning Saint Kentigern (also known as Saint Mungo), which feature a Leudonus, king of Leudonia, a Latin name for Lothian. In the 12th century, Geoffrey of Monmouth adapted this to Lot, king of Lothian, in his influential chronicle Historia Regum Britanniae, portraying him as King Arthur's brother-in-law and ally. In the wake of Geoffrey's writings, Lot appeared regularly in later romance.