The Kingdom of the Isles and Rivers

The Kingdom of the Isles and Rivers was created when Harwyn Hoare conquered the Riverlands from Arrec Durrandon. The Kingdom consisted of the Iron Islands and the newly conquered Trident. It is currently ruled by House Hoare from Harrenhal, with other holdings in Fairmarket and The Old Keep in the Iron Islands.

History
Harwyn Hoare met Arrec Durrandon at Fairmarket on the Blue Fork. Arrec had half again as many stormlanders as Harwyn's ironborn and rivermen, but the former were ill-supplied and tired. Although outnumbered, the longships of the ironborn allowed them to seize the river crossing. Arrec was headstrong and indecisive in the battle, which turned into a shattering defeat for the Durrandons, who lost half their men. Two of Arrec's brothers fell in the fighting, although Arrec was able to escape. Harwyn, much to the anger of the Riverlords, claimed the Trident for himself, declaring the King of the Isles and Rivers.