They were all names of General Robert E. Lee's horses!
A bit more of the story can be found here....
Although Traveller was General Lee’s favorite horse, Lee did use other horses during the course of the Civil War. When Lee purchased Traveller, his stable already contained two horses, Richmond and Brown-Roan.
Two other horses, Lucy Long and Ajax, joined Lee’s stable after he purchased Traveller.
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Thanks for the heads up, Mary Kaye!