Epona, a beautiful girl, the fruit of a man's union with a mare. (Bibliotheca Classica, Lempriere, v.1, 1792)

    Epona, the Celtic horse-goddess, may be equated with the Chanteur or Centaur illustrated on so many of our "degraded" British coins, and Banstead Downs, upon which Ep's Home stands, may be associated with Epona, and with the shaggy little ponies which ranged in Epping Forest. (Archaic England, Bayley, 1920)

... The goddess Epona (whose name is formed from the Gaulish word epos "horse") is figured on a great number of monuments and generally in the form of a woman seated on a mare of mettlesome action.  One of these statuettes is found in the Cabinet des Medailles of Paris, and the pedestal is provided with an opening forming a box intended to receive the offerings of the faithful.  The Gauls were great horse rearers; and Epona presided over this occupation, and doubtless over horsemanship in general. (Celtic Magazine, v.12, 1887)