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  == Background ==
  Petyr descends from a Braavosi sellsword who served House Corbray. His father befriended Lord Hoster Tully during the War of the Ninepenny Kings, and Tully took the young Petyr as a ward. Petyr grew up at House Tully's castle Riverrun with Hoster's daughters Catelyn and Lysa, and son Edmure; Edmure nicknamed Petyr "Littlefinger" in reference to his short stature and his family's lands on the smallest of the Fingers. Petyr was a sly, mischievous child with the ability to always look contrite after his mischief. He became infatuated with Catelyn and claims to have lost his virginity to her while drunk; in reality, he lost it to Lysa, who was obsessed with him. When Catelyn was betrothed to Brandon Stark (Eddard Stark's elder brother), Petyr brazenly challenged him to a duel for her hand in marriage but lost easily to Brandon. Petyr's life was spared at Catelyn's behest. During his convalescence Petyr impregnated Lysa, but the pregnancy ended in a forced abortion, and Petyr was banished from Riverrun.
  Even after her marriage to Jon Arryn, Lysa remained in love with Petyr. Her patronage saw Baelish appointed as customs officer at Gulltown, a position he excelled at. In the books it was around this time that Petyr's unnamed father died and passed the unnamed "Baelish Tower" in the Fingers to his son, making him a lord. However, in the show it is implied that both of Baelish's parents died when Petyr was much younger. Jon Arryn, who was Hand to King Robert Baratheon, eventually brought Baelish to King's Landing as Master of Coin. When Arryn tries to have his and Lysa's son Robert sent to Dragonstone to be fostered by Stannis Baratheon, Baelish gives Lysa poison to kill Jon and convinces her to tell Catelyn that House Lannister was responsible. This subterfuge sets in motion the main events of the series.