Lisbon is part of Portugal.
Lisbon ( [ ˈlɪzbən ] Lisboa , [ liʒˈβoɐ ] ) is the capital and the largest city of Portugal , with a population of 552,700 within its administrative limits in an area of 100.05 km ² . The Lisbon region contributes with a higher GDP PPP per capita than any other region in Portugal . In 1147 , the Crusaders under Afonso Henriques reconquered the city and since then it has been a major political , economic and cultural centre of Portugal . Its position as the capital has formed through constitutional convention , making its position as de facto capital a part of the Constitution of Portugal . Oeiras ( [ oˈɐjɾɐʃ ] ) is a municipality in western part of the Lisbon Metropolitan Area , subregion of Greater Lisbon , in continental Portugal .