Antigonus II Gonatas was a king of the Hellenistic kingdom of Macedonia, ruling from 277 to 239 BCE. He was the son of Demetrius I of Macedon and a descendant of Antigonus I Monophthalmus, one of the generals of Alexander the Great. Antigonus II is known for stabilizing Macedonia after a period of turmoil and for his efforts to maintain control over the region. During his reign, Antigonus II faced challenges from rival factions and external threats, including the Celts and the Ptolemaic Kingdom. He successfully defended his kingdom and established a strong government, which helped to secure Macedonia's influence in the Hellenistic world. His reign marked a significant period in the history of Macedonia.