Rohan, originally Rochand or Rochann, was a kingdom of Men, located in the land once called Calenardhon, situated in the great vale between the Misty Mountains and the White Mountains (Ered Nimrais). The land of Rohan extended from the fords of the river Isen in the west, up to the shores of Anduin the great in the east. The forest of Fangorn lay within the borders of Rohan, and Lorien lay to the north of the river Limlight. The land was known as Rohan to the Men of Gondor, and its people the Rohirrim, meaning 'the Horse-lords', but the people of Rohan called themselves the Eorlingas, sons of Eorl the Young, first King of Rohan, as the land of Calenardhon was given in gift to Eorl and his people by Cirion, Steward of Gondor, in thanks for their service to Gondor in battle against the Balchoth. Eorl, the first king, swore an oath of friendship, at need or at call, to the Lords of Gondor, and thus the Rohirrim became the greatest allies of the Men of Gondor throughout the Third Age and beyond. They were known for their cavalry and horse training, which came into use countless times in battles such as Hornburg and on the Pelennor Fields.