In Chapter 38 of A Dance With Dragons, "The Watcher" (Areo Hotah's POV), Areo notes the following:
The white knight [Ser Balon Swann] did drink, as was only courteous. His companions likewise. So did the Princess Arianne, Lady Jordayne, the Lord of Godsgrace...
Godsgrace is held by House Allyrion, and House Allyrion is ruled by Lady Delonne Allyrion. I've checked the chapter summary on AWOIAF, and there is no linked page for "The Lord of Godsgrace"
Who could Areo be referring to?