Majaz al Bab, also known as Medjez el Bab, or as Membressa under the Roman Empire, is a town in northern Tunisia. It is located at the inter…Majaz al Bab, also known as Medjez el Bab, or as Membressa under the Roman Empire, is a town in northern Tunisia. It is located at the intersection of roads GP5 and GP6, in the Plaine de la Medjerda. It has been a titular see of the Catholic Church since 1933.