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It was founded three generations before the Targaryen Conquest, when the Kingdom of the Iron Islands under House Hoare conquered all of the Riverlands from the rule of the Kingdom of the Stormlands, led by House Durrandon.
The kingdom ceased to exist after the Targaryen conquest by Aegon I. House Hoare itself was destroyed by dragon-fire at the Burning of Harrenhal, and the Riverlands rose up against the remaining ironborn in a revolt led by Edmyn Tully.