The first documentary reference to this street dates from 1234. We know, however, that the street is much older. Natural continuation of Souto Street - with which it shared its name - it established the connection between the primitive nucleus of the village, on Pena Ventosa hill and the gate of the Fernandina do Porto olive grove and, from there, to the Braga and Vila do Conde and Viana do Castelo, integrated in the Camino de Santiago.

When the Rua das Flores was torn down in 1522, the part of the former Rua do Souto to the west took on other names. Rua da Laje and Ferraria de Cima were names that adopted the street in the following centuries. "Ferraria de Cima", as opposed to "Ferraria de Baixo" (now Rua do Comércio do Porto), both places where the blacksmiths workshops were operating.

The blacksmiths had Nossa Senhora da Silva as patron of their respective brotherhoods. The one of the upper blacksmiths was formed at the St. John the Baptist Hospital, located on the same street, on August 22, 1599. In 1682, the brotherhoods of the upper and lower blacksmiths were legally obliged to join by sentence. of the Civil Correction Court and confirmed by the Senate of the Relationship that "that their confreres, those from below and those from above" should be united, and that at the service of the Brotherhood that would result from this merger, "there were only a revenue and expenditure book, one commitment [ie, bylaws], one registrar and one provider. "

In 1616 we have references to "Rua da Caldeiraria", being the current name of Rua dos Caldeireiros for the first time in 1780.

The headquarters of the new Brotherhood of Nossa Senhora da Silva became the current street of Caldeireiros. The unification of the brotherhoods also implied changes with the hospitals. Thus, the existing hospital of St. John the Baptist, joined the hospitals of Santa Catarina and Santiago, coming from the riverside. The Santiago Hospital functioned primarily as a pilgrim hostel and was under an obligation "to provide clean, good beds in which to accommodate nine of these pilgrims who will be given entry and exit rations, and fire, water, and salt for them. make mister ". Blacksmiths have always been great devotees of Our Lady of Silva, of St. John the Baptist and of St. Baldomero, whose images appear in the chapel of the fellowship, of course, of Our Lady of Silva.

Also at Rua dos Caldeireiros, on the corner of Rua das Flores, was the old hospital of Rocamador, the first to be founded in Porto, still in the time of D. Sancho I, expanded and completely reformulated by the Santa Casa da Misericórdia do Porto, adopting the name of hospital of D. Lopo de Almeida. This became the citys main hospital center until the opening of the St. Anthonys hospital in 1799.

Still in Rua dos Caldeireiros, until 1869, there was the cruise of Senhor da Boa Fortuna. Having disappeared the cruise, the image is still conserved in a niche that is in the corner of the street of Ferraz.