Credit: HBO

During Game of Thrones Season 4, Episode 5 (“The First of His Name”), the mystery behind one of the show’s oldest mysteries was revealed: we learned the identity of Jon Arryn’s killer. Did you miss it?

In case you forgot, Jon Arryn was King Robert Baratheon’s Hand who was poisoned, which was the event that started all of the craziness on the show. We were always led to believe that the Lannisters poisoned Jon because he learned the truth about the parentage of Cersei’s children. While Jon Arryn did learn the truth about the Lannister kids, it wasn’t the Lannisters who killed him. As was briefly mentioned in last night's episode, Lysa Arryn murdered her husband, at the behest of Littlefinger. She then wrote a letter to her sister Cat claiming the it was the Lannisters. So why did Littlefinger arrange this?

Littlefinger loves chaos, as we saw earlier this season with his murder of Joffrey, and his murder of Jon Arryn was just the first step in his plan. By pitting the Lannisters and the Starks against one another, Littlefinger caused instability, which has allowed him to gain power that wasn’t availed to him previously. It’s worked out well for him. Since Jon Arryn’s death we’ve seen him advance from Master of Coin to Lord of Harrenhal to now Lord of the Vale.

We’ve said it before and we’ll say it again: Littlefinger might just be the baddest mother in this thing.

Did you see this twist coming? Let us know in the comments below!