Haizum
Archangel Gabriel
Traveller
Robert E. Lee
Khartoum (movie)
The horse in The Godfather whose head is...
Aldebaran, Atair, Antares, Rigel (movie, book)
Ben-Hur
Balius and Xanthos
Achilles
Rosinante
Don Quixote
Palomo
Simon Bolivar
Lamri
King Arthur
Hero
Phantom comics
Pegasus
Bellerophon
Blackie
Chief Sitting Bull
Ginger, Merrylegs
From Black Beauty by Anna Sewell
Tornado (ridden by a hero)
Zorro
Shadowfax
Gandalf
Gunpowder
Ichabod Crane
Arion
Hercules
Hippocampus
Neptune
Buraq
Prophet Mohammed
Incitatus
Emperor Caligula's favorite horse, may have been made a Senator
Copenhagen
Duke of Wellington
Kantaka
Buddha (when he was Prince Siddhartha)
Bucephalus
Alexander the Great
Affirmed
Last horse to win the U.S. Triple Crown (1978)
Sleipnir
Odin
Marengo
Napoleon
Widow-Maker
Pecos Bill
Babieca
El Cid
Silver
The Lone Ranger
Magnolia
George Washington