From A Wiki of Ice and Fire
|The Last Storm|
|Conflict||War of Conquest|
|Place||south of Bronzegate, the stormlands|
|Result|| Targaryen victory|
Conquest of the stormlands
Foundation of House Baratheon
After Aegon made his intentions of conquering Westeros and unifying the Seven Kingdoms under his rule, Argilac Durrandon, the Storm King of the stormlands, offered Aegon the hand of his maiden daughter, Argella but he refused. Instead, Aegon offered the hand of his closest friend and half-brother, Orys Baratheon, who was alleged to be a bastard. Enraged, Argilac had the hands of Aegon's envoy cut off and sent them to Aegon with the message “These are the only hands your bastard shall have of me.”
Aegon landed at the mouth of the Blackwater Rush and was crowned by one of his sister-wives, Visenya. He then received the allegiance of the riverlands by slaying King Harren Hoare through the burning of Harrenhal. Meanwhile, he had sent Orys alongside his other sister-wife, Rhaenys, atop of Meraxes, to conquer the stormlands. Argilac refused to die in the same manner as Harren and called his banners to Storm's End to meet Orys's host.
Atop Meraxes, Rhaenys scouted Argilac's movements and Orys fortified a strong defensive position in the hills south of Bronzegate. As the two armies closed on each other, a massive storm, that would give a name to the battle, broke out. Argilac, knowing he had almost twice as many men as the Targaryens and four times as many knights and heavy horse, decided to press the attack.
Three charges by Argilac's horsemen were slowed by the mud, although his spearmen had greater success on foot and the Durrandon host conquered two hills. Argilac broke through during the third charge, but encountered Rhaenys atop Meraxes, who slew Dickon Morrigen, the Bastard of Blackhaven, and Argilac's guard. In the confusion, Argilac was thrown from his horse and found himself face to face with Orys Baratheon. Both took a wound but soon Argilac would get his wish and would die fighting. His death ended the battle, as the stormlanders yielded or fled.
After her father's death, Princess Argella Durrandon barred Storm's End and declared herself Storm Queen. Nevertheless, her garrison, fearing to share the fate of Harren, revolted against Argella after a few days and delivered her to Orys, chained and naked. However, Orys treated her gently, removing the chains, covering her with his cloak and giving her food and wine. Afterward, Orys married Argella and became Lord Paramount of the Stormlands. He took the sigil and words of House Durrandon for his own family, House Baratheon. Rhaenys then flew from Storm's End to support Aegon at the Field of Fire.