In 1294, king of Portugal D. Dinis built a westward extension along the Tagus estuary radiating from the southwesternmost corner of the "cerca moura". Construction took less than a year. Probably built to protect expanding Lisbon's shoreline commerce from piracy, it did not enclose any sector of Lisbon but barricaded the low-lying parts of what is now the Baixa. The 1755 earthquake destroyed aboveground sections of the wall, but excavations under the Bank of Portugal revealed its extensive foundations, now open to public view.