Why not brainstorm the great horses' names? suggests Wordwind.

Great idea. Make a game out of it? Maybe a variation of Steve Allen's "The Question Man," if we can really be clever. But start simple. So far we have

Rosinante was owned by Don Quixote, and
Bucephalus was owned by Alexander the Great
Traveller was owned by General Robert E Lee
Ariel was owned by Plath (don't know who he is, sorry to admit)
Trigger was owned by Roy Rogers
Eeyore was owned by Christopher Robin Milne ( +/- for that one)

and have been challenged to give the owners (if any) of

Black Beauty was owned by _____
Flicka was owned by _____ answered by Jackie
Pegasus was owned by _____ (fill in the blanks)

So now let's add a few:

Who owned
-- Silver
-- Scout
-- Champion
-- Topper

and -- play it in either direction --
what was the name of Dale Evans' horse?
the Cisco Kid's?
Did Gabby Hayes' horse have a name?

I'm sure there are plenty of famous horses, real or fictitious or mythological, that I don't know (not that I know all of these, either!) - let's have more names ?!