Running several miles long, these sprawling walls have protected the city since the time of the Caesars. The walls cleverly make use of the two rivers that snake through the meadowland, shielding it from enemies east and west. All traffic is channeled through specific chokepoints, the Bars, where toll can be extracted, or arrows and fire rained down.

Source: game/common/buildings/ccp3_special_buildings.txt, game/common/holdings/00_holdings.txt, game/common/script_values/00_building_values.txt and the English localisation, Crusader Kings III 1.20.0.3.