Consisting of neighborhoods of Sol, Palacio, Universidad, Justicia, Cortes, and Embajadores, Madrid's Central District (known as Centro locally) is the oldest of all Madrid’s districts. It is a culturally enriched area, where less than 80% of the population is a true Madrileno, while the rest are foreigners working, studying, or visiting the area. The Central District's multicultural state dates back to the times when Madrid was first recognized as a crucial connection between the north and south of the Iberian Peninsula, and Philip II relocated his court to this city. As the city grew, his grandson, Philip IV, erected a wall known as the Real Cerca of Philip IV around the old town. While the wall has since been removed, its former place continues to demarcate the oldest parts of Madrid, which became known as the Centro.