Despite King #Arthur`s gifts and good nature, all was not to be well in Camelot. The beautiful Lancelot and queen Guinevere fell in love, and Lancelot exiled himself rather than betray his king. Finally their love grew too strong to resist. Although they kept it secret, the land knew the truth: The crops failed for seven years while Arthur attempted to discover the cause. At the same time, his estranged son Mordred—born of a secret liaison with his own sister #Morgause—began to war against Arthur. In the chaos of battle, Arthur was mortally wounded. He did not die, however. Casting Excalibur into a lake, he was borne across its waters to the #otherwordly Avalon by mysterious women, thus becoming the “once and future king.”
Source: P. Monaghan `Encyclopedia of #Celtic #Mythology and #Folklore`