King Arthur's Knights: The Tales Re-Told for Boys and Girls

According to Wikipedia: "King Arthur is a legendary British leader who, according to medieval histories and romances, led the defence of Britain against Saxon invaders in the early sixth century. The details of Arthur's story are mainly composed of folklore and literary invention, and his historical existence is debated and disputed by modern historians. The sparse historical background of Arthur is gleaned from various sources, including the Annales Cambriae, the Historia Brittonum, and the writings of Gildas. Arthur's name also occurs in early poetic sources such as Y Gododdin."