My Dearest Cat,
If you are reading this letter it means that I have died.. well more likely I have been killed. I speak to you now unbound from any obligation to secrecy.
I think now of something I heard once, "There's nothing as sweet as killing." In my case I would change this slightly.. there is nothing as sweet as winning. All of my efforts and all the blood I have shed has been for you. For us, and our future.
Your husband would have you think he is honorable because he has restraint; because he has will and self control. Being born into a Great house has made him, and you entitled to what you have. I have built everything in my life from nothing. Sacrificed my whole identity to raise myself from the dirt to show you I was worthy.
Despite my efforts you never saw me for who I am. The image of the young wastrel orphan seems to never have left you.
In creating my own destiny I have become more powerful than the Gods you worship. I will live forever.
I give you one final gift, upon the eve of my death. Information. May this help you and yours keep their heads, unlike that boy of yours.
To my knowledge I have never been protected by any other. The lannisters have been trying to kill me for years..
Remember me, my only love.