Guithelin was a legendary king of the Britons as accounted by

Geoffrey of Monmouth Geoffrey of Monmouth (; ; ) was a Catholic cleric from Monmouth, Wales, and one of the major figures in the development of British historiography and the popularity of tales of King Arthur. He is best known for his chronicle '' The History of ...

. He became king after the death of Gurguit Barbtruc and reigned approximately 379 BC. He ruled liberally and temperately for his life. His

Queen consort A queen consort is the wife of a reigning king, and usually shares her spouse's social Imperial, royal and noble ranks, rank and status. She holds the feminine equivalent of the king's monarchical titles and may be crowned and anointed, but hi ...

was an artisan and noblewoman named Marcia; when he died, his wife took over the government as regent for their son, Sisillius II.Sacred Texts website, ''Histories of the Kings of Britain (Book III)'', by Geoffry of Monmouth, tr. by Sebastian Evans, (1904)
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References

{{Geoffrey of Monmouth Legendary British kings