Some remaining fragments of the Roman walls have been incorporated into the cathedral.
The cathedral, also known as the Basilica La Seu, is said to have been founded in 343.
The city is also referred to as the Ciutat Comtal in Catalan, and Ciudad Condal in Spanish, owing to its past as the seat of the Count of Barcelona.
The origin of the earliest settlement at the site of present-day Barcelona is unclear.
The first attributes the founding of the city to the mythological Hercules.
The second legend attributes the foundation of the city directly to the historical Carthaginian general, Hamilcar Barca, father of Hannibal, who supposedly named the city Barcino after his family in the 3rd century BC, 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 contemporary city hall (Plaça de Sant Jaume).
Under the Romans, it was a colony with the surname of Faventia, 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.