In a poem, this person retired to the woods of King Rhydderch (“RUH-therck”) where he lived in a house with seventy windows. This person was trapped under a large stone, a tree, or in an invisible tower by Viviane. This person (10[1])revealed that Vortigern’s tower couldn’t be built because a red and a (10[1])white (10[1])dragon were battling below it. A story by Geoffrey of (-5[1])Monmouth explains that this person moved Stonehenge to honor the older brother of Uther Pendragon. T.H. White fictionalized the idea that this person (10[1])lives time backwards (10[1])and is continually (10[1])growing (10[1])younger. This mentor of Morgan le (10[1])Fey sealed (10[1])the Sword in the Stone. For 10 points, (10[1])name this magical advisor (10[1])to King Arthur. ■END■