He is well-known for playing false and having his own best interests in mind; when Eddard Stark came to King's Landing to be Robert's Hand, he sought help from Littlefinger. After sneaking Catelyn into King's Landing and then smuggling her back out, Petyr turned around and betrayed Ned to Cersei Lannister (though he did warn Ned not to trust him.) Petyr later reveals to Tyrion Lannister that he took Catelyn's and Lysa's maidenhood, and in A Storm of Swords, he goes to the Vale to convince Lysa Arryn to join the side of the Iron Throne in the War of the Five Kings. Instead of winning Lysa to his cause, he stays to court her (as she has never fallen out of love with him). Later, he spirits Sansa Stark away from King's Landing and the Lannisters to bring her to the Vale. Petyr claims that Sansa is his bastard daughter "Alayne" to protect her from those who would harm her, and later kisses her. When Lysa finds out, she threatens to kill Sansa, but Littlefinger has her killed and blames the singer Marillion for the deed. It is in this scene that Sansa learns that Littlefinger convinced Lysa to kill her husband Jon Arryn.