Asfaloth was ridden by Glorfindel during the search for Aragorn and the Hobbits on their way to Rivendell. After he found them and the Black Riders attacked, Glorfindel dismounted and placed Frodo Baggins (the Ring-bearer) on its back, then ordered it forward to safety at the Ford of Bruinen. Asfaloth was a remarkably fast horse, outpacing the black steeds of the Black Riders, even though they reached the Ford first.
Source:
https://www.deviantart.com/gellihana-art/art/Asfaloth-280234845--
FROM 216.240.30.*