A city was built adjacent to the sacred sites that acquired monumental form during the reigns of Alexander the Great's successors and Cassander took a great interest in the city erecting strong walls and public buildings, so that in Hellenistic times Dion was renowned far and wide for its fortification and splendid monuments. Dion and its sanctuary was destroyed during the Social War in 219 BC by Aetolian invaders but was immediately rebuilt by Philip V. Many of the dedications from the sanctuary that had been destroyed were buried in pits, including royal inscriptions and treaties, and these have been discovered recently.