This is a list of original characters of note found in Peter Jackson's film adaptation of J. R. R. Tolkien's The Lord of the Rings.
Brego the Horse belonged to King Théoden's son, Théodred, who had just been killed in a battle with Orcs. Aragorn speaks to Brego in Sindarin to quiet him. Aragorn says to Éowyn, "Turn this fellow free. He has seen enough of war." This first scene between Aragorn and Brego appears only in the extended version of The Two Towers.
Later, on the march to Helm's Deep, Aragorn is injured fighting Orcs on Wargs, falls off a cliff into a river, and is carried downstream. Brego then comes to the wounded Aragorn and lies down on the beach next to him so Aragorn can climb onto its back. He carries him the rest of the way to Helm's Deep. This side story does not exist in the book. Aragorn rides Brego in the charge out of Helm's Deep and to the Rohirrim camp at Dunharrow, but Brego runs away and refuses to enter the Paths of the Dead. It is unclear if the horse Aragorn rides to the Black Gate is Brego, though it has similar colouration.
Brego is largely played by a bay Dutch Warmblood stallion named Uraeus. Before his movie career, Uraeus was an FEI dressage star. Ridden by his then-owner Lockie Richards, he won New Zealand National Dressage titles. Like Viggo Mortensen, who plays Aragorn, who was brought on board to replace a previously cast actor after the filming had already begun, Uraeus was brought out of semi-retirement to replace the horse previously cast as Brego, who turned out not to be adequate. At the end of the trilogy's filming, Mortensen had created such a strong bond with Uraeus that Richards agreed to sell the horse to him. Uraeus remains in New Zealand, looked after by Jane Abbott, one of the riding doubles who works on Peter Jackson’s films.