Go to the Residential District of Lowtown and return item to "East-Wise" Gerralt.
ps3xbox360 It is possible to earn infinite experience points and gold. With your weapon drawn, turn in the quest while pressing continuously the button "A" (Xbox) or "X" (PS3). However, this exploit will no longer work with later patches.
The name may be a reference to Geralt of Rivia, the main protagonist in the Witcher series created by CD Projekt. In this series, Geralt is a magic-using monster-hunter who has been mysteriously resurrected.