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  ===Background===
  Before he became king, Robert Baratheon was the ward of Jon Arryn and was raised at the Eyrie alongside Eddard Stark.  Fifteen years before the novels, Robert was betrothed to Ned's younger sister Lyanna, with whom he was madly (and unrequitedly) in love.  After Lyanna disappeared with Rhaegar Targaryen, Robert led a rebellion to overthrow the Targaryen dynasty and later killed Rhaegar in single combat.  He then married Cersei Lannister to ensure House Lannister's support for his rule, but remained attached to the memory of Lyanna, resulting in an estranged marriage with Cersei.