Gawain is King Arthur

King Arthur

King Arthur is a legendary British leader of the late 5th and early 6th centuries, who, according to Medieval histories and romances, led the defence of Britain against Saxon invaders in the early 6th century. The details of Arthur's story are mainly composed of folklore and literary invention, and...

's nephew and a Knight of the Round Table

Round Table (Camelot)

The Round Table is King Arthur's famed table in the Arthurian legend, around which he and his Knights congregate. As its name suggests, it has no head, implying that everyone who sits there has equal status. The table was first described in 1155 by Wace, who relied on previous depictions of...

 who appears very early in the Arthurian legend's development. He is one of a select number of Round Table members to be referred to as the greatest knight, most notably in Sir Gawain and the Green Knight

Sir Gawain and the Green Knight

Sir Gawain and the Green Knight is a late 14th-century Middle English alliterative romance outlining an adventure of Sir Gawain, a knight of King Arthur's Round Table. In the poem, Sir Gawain accepts a challenge from a mysterious warrior who is completely green, from his clothes and hair to his...

. He is almost always portrayed as the son of Arthur's sister Morgause

Morgause

Morgause , known in earlier works as Gwyar or Anna, is the sister or half-sister of King Arthur in the Arthurian legend. In her earliest appearance she is Arthur's full sister by Uther Pendragon and Igraine; Gwyar is her name and she is the mother of Gwalchmei...

 (or Anna) and King Lot

King Lot

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 evidently first appeared in hagiographical material concerning Saint Kentigern , which feature a Leudonus, king of Leudonia, a Latin name for Lothian...

 of Orkney and Lothian

Lothian

Lothian forms a traditional region of Scotland, lying between the southern shore of the Firth of Forth and the Lammermuir Hills....

, and his brothers are Agravain

Agravain

Sir Agravain or Sir Agravaine is a nephew of King Arthur and a Knight of the Round Table in Arthurian legend. He is the second son of King Lot of Orkney and Lothian and Morgause , full brother to Gawain, Gaheris and Gareth. His half-brother and most frequent associate in the Post-Vulgate Cycle is...

, Gaheris

Gaheris

Gaheris is a figure of Arthurian legend, a knight of the Round Table, and a son of Morgause and King Lot of Orkney and Lothian. His brothers are Gawain, Agravaine, Gareth and Mordred, a half-brother. His mother is a daughter of Gorlois and Igraine, and a sister of Elaine and Morgan le Fay...

, Gareth

Gareth

Sir Gareth was a Knight of the Round Table in Arthurian Legend. He was the youngest son of Lot and of Morgause, King Arthur's half-sister, thus making him Arthur's nephew, as well as brother to Gawain, Agravain, Gaheris, and half brother of Mordred...

, and Mordred

Mordred

Mordred or Modred is a character in the Arthurian legend, known as a notorious traitor who fought King Arthur at the Battle of Camlann, where he was killed and Arthur fatally wounded. Tradition varies on his relationship to Arthur, but he is best known today as Arthur's illegitimate son by his...

. In some works he has sisters as well.

Gawain is often portrayed as a formidable but brash warrior, fiercely loyal to his king and family.