Portuguese explorer Paulo Dias de Novais founded Luanda on 25 January 1576 as "São Paulo da Assumpção de Loanda", with a hundred families of settlers and four hundred soldiers. In 1618 the Portuguese built the fortress called Fortaleza São Pedro da Barra, and they subsequently built two more: Fortaleza de São Miguel (1634) and Forte de São Francisco do Penedo (1765-6). Of these, the Fortaleza de São Miguel is the best preserved.