" Faithful servant yet master's bane,
Lightfoot's foal, swift Snowmane "

Those were the words carved into the stone over Snowmane's gravesite upon the Pelennor Fields of Gondor.

He was the horse of Théoden King of Rohan who fell upon his master in battle, crushing him to his death.
Encyclopedia entry originally written by Nienna-of-the-Valar