Episode 4-4
Title: "Oathkeeper"
Directed by Michelle MacLaren
Written by Bryan Cogman
Original Air Date -- April 27, 2014
Daenerys successfully captures Meereen amidst a slave revolt, and immediately seeks justice for the slain slave children by nailing 163 masters to posts. At sea, Petyr admits to Sansa that he was responsible for poisoning Joffrey, despite his alliance with the Lannisters. In King's Landing, Olenna also intimates to Margaery that she ordered the poisoning, and encourages Margaery to seduce Tommen before Cersei has a chance to turn him against her. Jaime meets with Tyrion, and is convinced he is not guilty. However, Cersei is adamant about Tyrion's guilt, and orders Jaime to hunt down and kill Sansa. Jaime instead tasks Brienne with finding and protecting Sansa, and sends Podrick along with her. In the North, in an effort to get rid of Jon, Alliser Thorne and Janos Slynt conspire to allow Jon to lead an expedition against the Night's Watch mutineers occupying Craster's Keep. Meanwhile, Bran and his party stumble upon Craster's Keep, where they are captured by the mutineers, and Bran is forced to reveal his identity to them. Further north, a White Walker takes Craster's last newborn son to a secret ritual site, where another White Walker touches the baby's face, turning its eyes blue.
Source:
https://en.wikipedia.org/wiki/Game_of_Thrones_(season_4)