Who? Me? I think I might have gotten a couple of things mixed up in there, but I definitely still believe that it was Celmomas who was hanging from a rope in the prologue.
Here are the facts as far as I remember them:
1. At the Fields of Eleneöt, Celmomas ‘died’ (his eyes went blank) after making the prophecy. Ganrelka was present and was rescued by five knights of Trysë who later end up in Ishuäl. This was 2146. However, Ganrelka was not immediately taken to Ishuäl, he became the last reigning High-King of Kûniüri.
2. In 2147, Trysë was sacked by the No-God’s horde. Presumably, everyone who didn’t read the prologue thinks that Ganrelka was killed there with the rest of his family, since Trysë was the seat of the Kûniüric High-Kings. I believe Achamian even remarks somewhere that the Anasûrimbor house perished with the sack of Trysë. The fact that he was secretly smuggled to Ishuäl was most likely... a secret.
What I was saying in that post is that I believe that, just like Ganrelka, Celmomas did not actually die on the battlefield but was declared dead and taken to Ishuäl in secret a year before Ganrelka, following the Fields of Eleneot battle. Ishuäl was Celmomas’ idea after all and Seswatha is the one who knew about it, what better way to escape to it than by having Seswatha shout "our king is dead" before the physicians have even arrived?
And besides, the prologue says that it was the uncle who lead the heartbreaking assault on Golgotterath’s gates in the early days of the Apocalypse, and elsewhere we are told that it was Celmomas who lead the heartbreaking assault on the Golgotterath’s gates in the early days of the Apocalypse.