The history of the portal is associated with the name of Saint Vincent. Arriving in the city from Valencia, during one of the sermons, the monk suddenly saw an angel with a sword, who let know that he was defending Barcelona on the orders of Christ himself. In the help from above, the inhabitants could be sure when, after their prayers, their heavenly patron miraculously stopped the furious plague epidemic. Grateful townspeople installed a chapel with a sculpture of an angel in the gate area.