I’m not ashamed to admit that I understand less and less as we move on (and we are only a tiny fraction of the way through the Cantos).
The Sixth Canto features references to Eleanor of Aquitaine and her first husband, King Louis II of France (as did the Fifth Canto) and to her husbands’ (she had three – including King Henry II of England) and children’s (including King Richard I, Coeur-de-Lion, of England) relationship to the Outremer and the Crusades, including to Acre, the last of the cities held by western Crusaders to fall.
In fact, insofar as I comprehend this, it seems to be entirely about the fascinating life of Eleanor.