Forlong was the Lord of Lossarnach. Though he, and many of his followers, were not of Númenórean descent, they fought for Gondor. Together with 200 well-armed men he rode to the aid of Minas Tirith on the 9th of March, T.A. 3019.
He is in charge of 200 men and is greeted by the song "Forlong, Forlong, true friend, true heart"