Canon Background
https://awoiaf.westeros.org/index.php/Ilyn_Payne

In-Campaign
He was a combatant in the sunset melee at the tournament celebrating the royal marriage of Robert Baratheon and Cersei Lannister. He traded blows with Jardon Pyke in the opening seconds of the melee, but his foe was able to slip away after sustaining a wound.