Aegon Targaryen, also known as Aegon the Conqueror, was the first king of the Targaryen dynasty in Westeros. He is famous for uniting the Seven Kingdoms through conquest, using his dragons, including Balerion the Black Dread. Aegon's reign marked the beginning of the Targaryen rule, which lasted for nearly 300 years. Aegon established the Iron Throne, made from the swords of his defeated enemies, as a symbol of his power. He also founded King's Landing as the capital of his new realm. His legacy includes the Targaryen bloodline, which played a significant role in the history of Westeros.