Gondor

Gondor was founded by the brothers Isildur and Anarion, exiles from Numenor. Gondor was an allied kingdom with Arnor, whose line of kings chieftains came from Isildur, while the Line of the Kings of Gondor was from Anárion. Gondor was at the height of its power in its early years due to the ships and the military might that its armies possessed.

However, continued attacks by allies of Sauron, civil war, and a devastating plague caused it to gradually decline over the course of the Third Age.