From submissive warrior-eunuch slave to the master of war for the exiled queen of Westeros, Grey Worm, a man named after vermin, has been through quite a journey. Even before Daenerys Targaryen made her introduction, and certainly after. While fans don't know much about the traumas Grey Worm experienced before his time with Daenerys, what they do know is that he was taken by the slave master of Astapor and turned into one of the most intelligent and fierce warriors among an army of fierce and intelligent warriors.