This study of the Celtiberian town Contrebia Belaisca is the occasion for setting the record straight of the data drawn from many sources, literary, numismatic and epigraphic and of the archeological results concerning the city. All constitute an exceptional dossier for the region, the median valley of the Ebro river, and the era, the end of the Roman Republic. The town is remarkable, among other things, for a noteworthy public edifice on account of its architecture, the outcome of its economic and commercial dynamism, for an aristocratic homestead bearing the mark of Italic influences, for several bronze tables mentioning judiciary results, testifying to the strategic position of the town in the province of Hispania Citerior, and for a list of part of its inhabitants enabling us to have a better view of its social components. All together these elements enable us to draw a partial yet unique picture of a Celtiberian town under Roman rule between the end of the IInd century and the beginning of the Ist century B.C.