Battle of Ipsus
The careers of Antigonus's grandfather and father showed great swings in fortune. After coming closer than anyone to reuniting the empire of Alexander, Antigonus Monophthalmus was defeated and killed in the great Battle of Ipsus in 301 BC and the territory he formerly controlled was divided among his enemies, Cassander, Ptolemy, Lysimachus, and Seleucus.