Portugal: An image of Santa Barbara (Saint Barbara) and her tower from Recolhimento das orfas de Nossa Senhora da Esperanca (Our Lady of Hope's Gathering of Orphaned Girls), now in the Museu da Misericordia do Porto, Porto. Saint Barbara was an early Christian Greek saint and martyr. She is often portrayed with a tower. As one of the Fourteen Holy Helpers, Barbara is a popular saint, perhaps best known as the patron of armourers, artillerymen, military engineers, miners and others who work with explosives because of her legend's association with lightning, and also of mathematicians.