Prad Vidal was the Duke of Elacca, a sub-continent on the Ecazi Homeworld, and a vassal to Archduke Armand Ecaz. He was responsible for the murders of the Ecazi heiress, Ilesa Ecaz and the Swordmaster Rivvy Dinari during the wedding ceremony of Ilesa and Duke Leto Atreides I on the planet Caladan.