About 6,000 years after the Andal invasion Aegon Targaryen laid siege to Westeros in the War of Conquest. Aegon's host only had about 1,600 men but he had something that no one else had, dragons.
Westeros was still divided into seven kingdoms and there wasn't much unity between them. Aegon along with his two sister-wives, Rhaenys and Visenya worked their way through Westeros conquering the lands.
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