Rederchius (Welsh: Rhydderch mab Arthmael) was a legendary king of the Britons according to Geoffrey of Monmouth's History of the Kings of Britain (1136). He was preceded by Redon and succeeded by Samuil Penissel.
- History of the Kings of Britain 3.19 at Wikisource. Lewis Thorpe's translation for Penguin Classics (p. 105) gives two kings following him, Samuil followed by Penessil.
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