structural:reformatting
Roman Barcelona

In about 15 BC, the Romans redrew the town as a castrum (Roman military camp) centred on the " Mons Taber ", a little hill near the Generalitat (Catalan Government) and city hall buildings. The Roman Forum, at the crossing of the Cardo Maximus and Decumanus Maximus, was approximately placed where current Plaça de Sant Jaume is. Thus, the political centre of the city, Catalonia, and its domains has remained in the same place for over 2,000 years.

Under the Romans, it was a colony with the surname of Faventia, or, in full, Colonia Faventia Julia Augusta Pia Barcino or Colonia Julia Augusta Faventia Paterna Barcino. Pomponius Mela mentions it among the small towns of the district, probably as it was eclipsed by its neighbour Tarraco (modern Tarragona), but it may be gathered from later writers that it gradually grew in wealth and consequence, favoured as it was with a beautiful situation and an excellent harbour. It enjoyed immunity from imperial burdens. The city minted its own coins; some from the era of Galba survive.

Important Roman vestiges are displayed in Plaça del Rei underground, as a part of the Barcelona City History Museum (MUHBA); the typically Roman grid plan is still visible today in the layout of the historical centre, the Barri Gòtic (Gothic Quarter). Some remaining fragments of the Roman walls have been incorporated into the cathedral. The cathedral, Catedral Basílica Metropolitana de Barcelona, is also sometimes called La Seu, which simply means cathedral (and see, among other things) in Catalan. It is said to have been founded in 343.