Question: does tywin lannister know who arya is?
Answer: Littlefinger Confirms Arya Theory From 'Game Of Thrones' Season 2. ... At the time Arya was working as Tywin's cupbearer. Tywin knew she was a northerner and high-born to boot. But he didn't know she was that northerner or that highborn, or he would never have let her escape.