The Ancient Bridle is a key item from The Legend of Zelda: Breath of the Wild. It is a thematic bridle that Link can equip to his horse, built from Ancient Sheikah technology. It can be obtained upon "The Champions' Ballad" DLC pack 2 installation. Located under the cherry blossom tree on Satori Mountain, it gives the horse equipped with the Bridle two extra spurs.
Equipping this bridle on a 2/5/3 wild horse results in the all-around fastest horse in the game, with 5 speed and 5 spurs. These horses are typically found south of Hebra Tower near Serrene Stable, by gliding down and looking for solid-colored horses with three spurs.