Haraldr Guðrøðarson ruled a kingdom that was located in what body of water?
Haraldr Guðrøðarson:  Haraldr Guðrøðarson and his predecessors were members of the Crovan dynasty, and ruled an island-kingdom that encompassed the Mann and portions of the Hebrides, variously known as the Kingdom of the Isles or the Kingdom of Mann and the Isles. Kingdom of the Isles: The Kingdom of the Isles comprised the Hebrides, the islands of the Firth of Clyde and the Isle of Man from the 9th to the 13th centuries AD.
Firth of Clyde