Summer Isles
From A Wiki of Ice and Fire
The Summer Islands are a number of islands in the Summer Sea, to the south of Westeros, that form a single nation. The port of Tall Tree Town serves as its capital. The natives of the islands are a dark-skinned people who speak their own language and often wear capes of brightly colored feathers. Archery is an important cultural skill to the Summer Islanders. Their special bows have a longer range than most others, giving their merchant boats added defense against pirates.
During the events of A Song of Ice and Fire, an exile prince of the Summer Islands, Jalabhar Xho, lives in King's Landing. For many years he unsuccessfully attempts to convince the kings of the Seven Kingdoms to invade the Summer Islands and install him as their ruler.