In the A Song of Ice and Fire novels, the Shield Islands are named as follows: * Greenshield, the easternmost of the islands, ruled by House Chester. * Greyshield, the westernmost of the islands, ruled by House Grimm. * Oakenshield, the northernmost of the islands, ruled by House Hewett. * Southshield, the southernmost of the islands, ruled by House Serry. The islands are equipped with beacon fires. At the first sign of longships, the fires are lit, resulting in a relay of warnings being sent across all four islands.