What Shakespearean play named after a King of the Britons recorded by the medieval scribe Geoffrey of Monmouth included a character  considered a villain, obsessed with power and overthrowing her elderly father?
Regan (King Lear) Regan is a fictional character in William Shakespeare's tragic play, "King Lear", named after a King of the Britons recorded by the medieval scribe Geoffrey of Monmouth.
Guiderius Guiderius (Welsh Gwydr) is a legendary British king according to Geoffrey of Monmouth's "Historia Regum Britanniae" ("History of the Kings of Britain") and related texts. He can probably be identified as deriving from the historical Togodumnus.