The Mula of Villardiegua Monument · Villardiegua de la Ribera, Sayago, Zamora Image of Villardiegua de la Ribera, not of the place itself. This Vettonian verraco from the castro of San Mamede measures 2.10 metres long by 0.74 wide; despite its masculine features it is called la Mula or la Yegua, and from that name the village's own seems to come. Photo: No machine-readable author provided. Mitrídates~commonswiki assumed (based on copyright claims). (Public domain) What to see and do in Villardiegua de la Ribera