Sir Elise

In Book 2 of Malory's le Morte following the adventure of Alisander and the pretty Pilgrim, the haut knight Galahaut, ruler of Surluse, requests permission from Arthur to hold a joust of eight days. On the fifth day, Sir Palomides starts out the morning conquering all comers. Malory states that a worshipful duke and uncle of Arthur is smote down and follows up with a statement 'Then Sir Elise's son rode unto Palomides, and Palomides served Elise in the same wise', which would seem to indicate that the duke's name was Elise and that both he and his son, similarly named are defeated. This is the only entry for these two knights as far as I can tell.