Plovdiv (Пловдив, ˈpɫɔvdif) is the second-largest city in Bulgaria, standing on the banks of the Maritsa river in the historical region of Thrace, behind the state capital Sofia. It has a population of 346,893 and 675,000 in the greater metropolitan area. Plovdiv is a cultural hub in Bulgaria and was the European Capital of Culture in 2019. The city is an important economic, transport, cultural, and educational center. Plovdiv joined the UNESCO Global Network of Learning Cities in 2016.
Plovdiv is situated in a fertile region of south-central Bulgaria on the two banks of the Maritsa River. The city has historically developed on seven syenite hills, some of which are high. Because of these hills, Plovdiv is often referred to in Bulgaria as "The City of the Seven Hills". There is evidence of habitation in the area dating back to the 6th millennium BCE, when the first Neolithic settlements were established. The city was subsequently a local Thracian settlement, later being conquered and ruled also by Persians, Ancient Macedonians, Celts, Romans, Byzantines, Goths, Huns, Bulgarians (Thracians, Bulgars, Slavic tribes, etc.), Crusaders, and Ottoman Turks.
Philippopolis (Greek: Φιλιππούπολις) was founded as a polis by the father of Alexander the Great, Philip the Great (359-336), the king of ancient Macedonia, settling there both Thracians and 2,000 Macedonians and Greeks in 342 BCE. Control of the city alternated between the Macedonian kingdom and the Thracian Odrysian kingdom during the Hellenistic period; the Macedonian king Philip V (221-179) reoccupied the city in 183 BCE and his successor Perseus (179-168) held the city with the Odrysians until the Roman Republic conquered the Macedonian kingdom in 168 BCE. Philippopolis became the capital of the Roman province of Thracia. The city was at the centre of the road network of inland Thrace, and the strategic Via Militaris was crossed by several other roads at the site, leading to the Danube, the Aegean Sea, and the Black Sea. The Roman emperor Marcus Aurelius (161-180) built a new wall around the city.