A Feast for Crows - The Soiled Knight
"The first Viserys intended his daughter Rhaenyra to follow him, do you deny it? But as the king lay dying the Lord Commander of his Kingsguard decided that it should be otherwise."
Ser Criston Cole. Criston the Kingmaker had set brother against sister and divided the Kingsguard against itself, bringing on the terrible war the singers named the Dance of the Dragons. Some claimed he acted from ambition, for Prince Aegon was more tractable than his willful older sister. Others allowed him nobler motives, and argued that he was defending ancient Andal custom. A few whispered that Ser Criston had been Princess Rhaenyra's lover before he took the white and wanted vengeance on the woman who had spurned him. "The Kingmaker wrought grave harm," Ser Arys said, "and gravely did he pay for it, but . . ."
". . . but perhaps the Seven sent you here so that one white knight might make right what another set awry. You do know that when my father returns to the Water Gardens he plans to take Myrcella with him?"