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Combat at the Tower of Joy

After lifting the siege at Storm's End, Lord Eddard Stark rode further south with six companions: Howland Reed, Lord Willam Dustin, Ethan Glover, Martyn Cassel, Theo Wull, and Ser Mark Ryswell. Eddard Starks army did not travel with him south to Dorne.
  Near the Red Mountains of Dorne, they found three knights of Aerys II's Kingsguard, Ser Arthur Dayne, Ser Oswell Whent, and the Lord Commander, Ser Gerold Hightower. They were guarding a tower which Rhaegar is said to have named the tower of joy. The Northmen and Kingsguard fought, with only Eddard and Howland surviving the combat.
  Inside the tower, Eddard found his sister Lyanna Stark, who extracted a promise from Eddard, Lyanna died shortly after with her brother by her side. Eddard later tore down the tower, so he could use the stones to make cairns for the eight dead men.
  Afterwards, Eddard travelled further south to Starfall, where he delivered the famed sword Dawn which had been in the possession of the Sword of the Morning. He gave it to Arthur's sister Lady Ashara Dayne who later jumped into the sea killing her on impact.