df5935a1__and_Guide___Page_77___GameSpy__Description
[Quest Name] "South-Song" Gerralt's Corpse [Starting Location] Abandoned Thaig [Description] 
You'll find this corpse while doing the piecemeal Forbidden Knowledge quest. When you get the quest, head over to Lowtown and speak to "East-Wise" Gerrale.
Dragon Age II - ps3 - Walkthrough and Guide - Page 77 - GameSpy
Description