After Lisbon, Porto is the second largest and most important city in Portugal. In fact, its metropolitan area is home to almost 3 million Portuguese people. This city exerts its influence and reference in the northern region of the country. Its long history and dynamism, offer a wide variety of heritage elements, which have earned the city a position as one of the places declared World Heritage Site by UNESCO.
Porto, of ancient foundation, maintained commercial contacts with the Greeks at the time of the apogee of this culture and colonial foundation. Later, after the fall of the Roman Empire and the invasion of the Germanic peoples, the city came under the control of the Swabian Kingdom. Later, with the arrival of the Muslims the city would fall under their control until it was conquered by the Christians in the 9th century.