In GoT chapter 4 when The Ned is talking to Cat and middlefinger and Cat is saying middlefinger is going to help The Ned, we get this thought from him.
That was not news that Eddard Stark welcomed, but it was true enough that ... It would not be the first time that Ned had been forced to make common cause with a man he despised.
Who is the other man he despises that he made common cause with and when was it? Any ideas?