The Roman conquest of Cauca Historical milestone · Coca, Tierra de Pinares, Segovia Image of Coca, not of the place itself. The Vaccaean city of Cauca, one of the most prosperous in the Duero valley, fell to Rome in the year 151 BC; in time it attained the status of a Roman municipium and came to house several thousand inhabitants, within the present-day municipal area of Coca. 151 a. C. Photo: Cruccone (CC BY 3.0) What to see and do in Coca