The Green Knight is a character from Arthurian literature. He is a formidable judge and tester of knights, and as such the other characters consider him as friendly but terrifying and somewhat mysterious.
In ‘Sir Gawain, the Green Knight,’ a 14th century alliterative poem by an anonymous poet, he is so called because his skin and clothes are green. The meaning of his greenness has puzzled scholars since the discovery of the poem, who identify him variously as the ‘Green Man,’ a vegetation being of medieval art; a recollection of a figure from Celtic mythology; a pagan Christian symbol — the personified Devil.
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The Daily Omnivore 