 During the War of the Usurper, before the sack of King's Landing, the Targaryen Queen Rhaella, who was pregnant, and her son Viserys were sent to Dragonstone along with part of the Targaryen fleet and a garrison of loyal soldiers.But after King's Landing fell, Robert Baratheon dispatched his brother Stannis to take the island stronghold.After a storm destroyed the royalist fleet, the Targaryen garrison tried to betray Viserys and his newborn sister, Daenerys, to Stannis (the queen had died in childbirth).