The capital of the County of Provence from the 13th century until the French Revolution, Aix-en-Provence has remained the cultural capital of the region. Its architecture contrasts with the neighboring metropolis of Marseille wide open to the Mediterranean. The opposition between the two cities goes back to their origins when the oppidum of Entremont, located 1.8 miles (3 km) north of Aix, was the capital of the Gallic tribe of the Salyens in conflict with the Greeks of the Phocaean city. Later, Aix-en-Provence successively became the administrative capital of the province under the Romans, the capital of the County of Provence, the seat of the Parliament of Provence, and the residence of the royal governor representing the central power.