Roberts Rebellion was a success and Robert Marries Lyanna. Ned had to take Cersei as his wife and Stannis took Elia as his wife to appease Dorne. Peace rains until the Greyjoy Rebellion is put down and Ned takes Theon as his hostage and ward. Six years later Jon Arryn dies and Robert rides North to name his old friend his new hand. (Being rewritten)

When Tywin joined the rebels during the war of the Usurper he made Robert promise to give back his son. It's well past time the King pays his debt to the Lannisters. It's time for the Kingslayer to marry. This is an AU obviously since Jaime doesn't get married and now that changes a lot. All characters created by GRRM though