1. Aerys Targaryen's paranoia grew after his capture at Duskendale, which led to a plot against him by Jon Arryn, Hoster Tully, Rickard Stark, and Tywin Lannister. They planned marriage alliances and the removal of Aerys from power. 2. At the Tourney of Harrenhal, Rhaegar Targaryen named Robert Baratheon's betrothed Lyanna Stark to the Queen of Love and Beauty, sparking war. After Lyanna's brother and father were killed, Ned Stark and Howland Reed fought Arthur Dayne, Gerold Hightower, and Oswell Whent at the Tower of Joy