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  ==== Season 5 ====
  Baelish brokers a marriage alliance between Sansa and Ramsay Bolton, the sadistic son of the new Warden of the North Roose Bolton. Baelish mentions to Roose how the alliance of the North and the Vale brought down the Targaryens, the "mightiest dynasty" in Westerosi history, with the implication that a new alliance might have similar effects. Although Baelish assures Roose that the marriage alliance will strengthen their respective positions, Baelish privately tells Sansa that Stannis Baratheon is marching on Winterfell and will likely defeat the Boltons in battle. However, before Sansa and Ramsay's wedding, Cersei summons Baelish to King's Landing to ascertain his loyalties. Baelish reassures Cersei of the Vale's allegiance to the Lannisters and tells her of Sansa's marriage to Ramsay, neglecting to reveal his role in arranging the marriage. Cersei is outraged, and Baelish offers to use the Vale's forces to defeat whomever is left of the Bolton and Baratheon armies following the battle, revealing that his true plan all along was to be named Warden of the North, a request Cersei grants. Before his departure Baelish meets with Olenna Tyrell, who is furious that testimony from Olyvar has led to the arrests of Margaery and Loras Tyrell. When Olenna threatens to reveal Baelish's role in Joffrey's murder, Baelish arranges for Lancel Lannister to tell the religious leader, the High Sparrow, of Cersei's crimes, leading to her arrest.