These models are part of the Tarragona Cathedral research project. The medieval metropolitan seat is the prolongation of the ancient religious practices developed in the sacred precinct of the cult of Emperor Augustus, a fundamental part of the urban complex of the Concilium Prouinciae Hispaniae Citerioris, the construction of which was completed during the Flavian dynasty. Later, the Christianisation of the Roman Empire and the socio-economic crisis led to the transformation of this great complex, which consisted of a two-hectare sacred square with two temples. The result of this process makes the Tarragona Cathedral complex into one of the best European examples of the processes of Christianisation of classical cities. In this case, in relation to the construction of the Visigoth bishopric and, in the 12th century, to the metropolitan centre of the Catalan counties.