Borondir
From Tolkien Gateway
One of six riders sent north from Gondor by Steward Cirion to seek the aid of the Northmen in war. Borondir was the only one to survive the journey and present the Seal of the Stewards to Eorl.
Borondir was called as Borondir Udalraph, "Borondir the stirrupless".
Of he and his journey to Eorl is made a song called Rochon Methestel, in which he was long remembered.