Sos, capital of the Cinco Villas Historical milestone · Sos del Rey Católico, Cinco Villas, Zaragoza Image of Sos del Rey Católico, not of the place itself. In 1711 Sos was designated capital of the Cinco Villas, the grouping of villas of the Navarrese frontier that Felipe V distinguished after the War of the Succession. The medieval urban ensemble was declared historic-artistic in 1968 and has hardly been altered. 1711 Photo: France64160 (CC BY-SA 3.0) What to see and do in Sos del Rey Católico