Petyr Baelish
Tyrion separately shares plans with Grand Maester Pycelle, Varys, and Petyr Baelish, to marry Myrcella off, but suggests a different husband to each of them. Cersei confronts Tyrion over the plan Tyrion gave to Pycelle, confirming Pycelle is her spy. Tyrion sends him to the dungeons, but not before Pycelle confesses that he told Cersei that Jon Arryn knew of her incest with Jaime. Tyrion convinces Baelish to meet Catelyn Stark in the Stormlands and persuade her to release Jaime.