Puerto Real is a seaport in Andalusia, in the province of Cádiz. As of 2010, it had a population 40,667. The town is located on the northern shore of the inner lobe of the Bay of Cádiz, on the site of the ancient Roman settlement of Portus Gaditanus. An ancient trading post, it is probably the oldest settlement on the Bay of Cádiz. It owes its modern name to the fact that it was rebuilt in 1488 by Ferdinand II of Aragon and Isabella I of Castile.