The nine sorceresses or nine sisters (Welsh: naw chwaer) are a recurring element in Arthurian legend in variants of the popular nine maidens theme from world mythologies. Their most important appearances are in Geoffrey of Monmouth's introduction of Avalon and the character that would later become Morgan le Fay, and as the central motif of Peredur's story in the Peredur son of Efrawg part of the Mabinogion.