After a long period of internal power struggles the empire built by Alexander was dismantled. In 276 BCE a grandson of one of Alexander's generals, Antigonus~Gonatus, established a new dynasty in Macedonia known as the Antigonid Dynasty. The Antigonid Dynasty is marked by it's tenuous relations with the Greeks. The Antigonid's regarded control of Greece to be a required element of their power, while the Greeks regarded the Antigonids as important to control the Northern Borders and prevent the influx of Gallic and Thracian invaders. Nonetheless, each party was fearful of the other's power and influence.