Red Dragon Knight

I was reading the R+L=J thread and it dawned on me that when Rhaegar disappears with Lyanna he takes her to the "Tower of Joy." If I'm not mistaken this is a reference to Arthurian Legend when Lancelot and Guinevere's love becomes known King Arthur plans to try Guinevere for treason and Lancelot rescues her and takes her to the Tower of Joy (or maybe the Castle of Joy). Both of these events lead to the end of a dynasty and the tragic deaths of a number of principal characters.