Submission of Sunspear
After taking Sunspear in 158 AC, the Prince of Dorne and forty Dornish lords bent the knee to Daeron I. To ensure their loyalties, Daeron had fourteen highborn hostages - one of which was Cassella Vaith - brought back to King's Landing by his cousin, Prince Aegon Targaryen. While the hostages secured the loyalty of the highborn Dornish, Daeron did not anticipate the tenacity of the Dornish smallfolk in resisting the invaders.
Massive revolts began after the murder of Lord Lyonel Tyrell, who had been left behind as governor of Dorne by Daeron, at Sandstone; undoing the Young Dragon's work. The young king was slain trying to suppress the uprising and King Baelor I Targaryen ascended the Iron Throne in 161 AC. Prince Viserys Targaryen wanted to put several of the hostages to death, but Baelor forbade any harm to come to the hostages. Baelor walked barefoot to Sunspear to forge a peace.