Antigonus II Gonatas father Demetrius I of Macedon
Birth and family
Antigonus Gonatas was born around 320 BC.  The origin of the Hellenistic nickname Gonatas is unknown. He was descended from the Diadochi (the successors of Alexander the Great) on both his father's and mother's side. His father was Demetrius Poliorcetes, himself the son of Antigonus I Monophthalmus, who then controlled much of Asia. His mother was Phila, the daughter of Antipater, who had controlled Macedonia and the rest of Greece since 334 BC and was recognized as regent of the empire, which in theory remained united. In the year of Antigonus Gonatas' birth, however, Antipater died, leading to further struggles for territory and dominance.
The careers of Antigonus's grandfather [Antigonus Monophthalmus] 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.King of Macedonia
Antigonus against Pyrrhus
Pyrrhus, king of Epirus, Macedonia's western neighbour, was a general of mercurial ability, widely renowned for his bravery, but he did not apply his talents sensibly and often snatched after vain hopes, so that Antigonus used to compare him to a dice player, who had excellent throws, but did not know how to use them. When the Gauls defeated Ptolemy Ceraunus and the Macedonian throne became vacant, Pyrrhus was occupied in his campaigns overseas. Hoping to conquer first Italy and then Africa, he got involved in wars against Rome and Carthage, the two most powerful states in the western Mediterranean. He then lost the support of the Greek cities in Italy and Sicily by his haughty behaviour. Needing reinforcements, he wrote to Antigonus as a fellow Greek king, asking him for troops and money, but Antigonus politely refused. In 275 BC, the Romans fought Pyrrhus at the Battle of Beneventum which ended inconclusively, although many modern sources wrongly state that Pyrrhus lost the battle. Pyrrhus had been drained by his recent wars in Sicily, and by the earlier "Pyrrhic victories" over the Romans, and thus decided to end his campaign in Italy and return to Epirus.
Pyrrhus's retreat from Italy, however, proved very unlucky for Antigonus. Returning to Epirus with an army of eight thousand foot and five hundred horse, he was in need of money to pay them. This encouraged him to look for another war, so the next year, after adding a force of Gallic mercenaries to his army, he invaded Macedonia with the intention of filling his coffers with plunder. The campaign, however, went better than expected. Making himself master of several towns and being joined by two thousand deserters, his hopes started to grow and he went in search of Antigonus, attacking his army in a narrow pass and throwing it into disorder at the Battle of the Aous River. Antigonus's Macedonian troops retreated, but his own body of Gallic mercenaries, who had charge of his elephants, stood firm until Pyrrhus's troops surrounded them, whereupon they surrendered both themselves and the elephants. Pyrrhus now chased after the rest of Antigonus's army which, demoralised by its earlier defeat, declined to fight. As the two armies faced each other, Pyrrhus called out to the various officers by name and persuaded the whole body of infantry to desert. Antigonus escaped by concealing his identity. Pyrrhus now took control of upper Macedonia and Thessaly, while Antigonus held on to the coastal towns.
But Pyrrhus now wasted his victory. Taking possession of Aegae, the ancient capital of Macedonia, he installed a garrison of Gauls, who greatly offended the Macedonians by digging up the tombs of their kings and leaving the bones scattered about as they searched for gold. He also neglected to finish off his enemy. Leaving him in control of the coastal cities, he contented himself with insults. He called Antigonus a shameless man for still wearing the purple, but he did little to destroy the remnants of his power.
Before this campaign was finished, Pyrrhus had embarked upon a new one. In 272 BC, Cleonymus, an important Spartan, invited him to invade Laconia. Gathering an army of twenty-five thousand foot, two thousand horse, and twenty-four elephants, he crossed over to the Peloponnese and occupied Megalopolis in Arcadia. Antigonus, after reoccupying part of Macedonia, gathered what forces he could and sailed to Greece to oppose him. As a large part of the Spartan army led by king Areus was in Crete at the time, Pyrrhus besieged Sparta with great hopes of taking the city easily, but the citizens organized stout resistance, allowing one of Antigonus's commanders, Aminias the Phocian, to reach the city with a force of mercenaries from Corinth. Soon after this, the Spartan king, Areus, returned from Crete with 2,000 men. These reinforcements stiffened resistance, and Pyrrhus, finding that he was losing men to desertion every day, broke off the attack and started to plunder the country.
The most important Peloponnesian city after Sparta was Argos. The two chief men, Aristippus and Aristeas, were keen rivals. As Aristippus was an ally of Antigonus, Aristeas invited Pyrrhus to come to Argos to help him take over the city. Antigonus, aware that Pyrrhus was advancing on Argos, marched his army there as well, taking up a strong position on some high ground near the city. When Pyrrhus learned this, he encamped about Nauplia and the next day dispatched a herald to Antigonus, calling him a coward and challenging him to come down and fight on the plain. Antigonus replied that he would choose his own moment to fight and that if Pyrrhus was weary of life, he could find many ways to die.
The Argives, fearing that their territory would become a war zone, sent deputations to the two kings begging them to go elsewhere and allow their city to remain neutral. Both kings agreed, but Antigonus won over the trust of the Argives by surrendering his son as a hostage for his pledge. Pyrrhus, who had recently lost a son in the retreat from Sparta, did not. Indeed, with the help of Aristeas, he was plotting to seize the city. In the middle of the night, he marched his army up to the city walls and entered through a gate that Aristeas had opened. His Gallic troops seized the market place, but he had difficulty getting his elephants into the city through the small gates. This gave the Argives time to rally. They occupied strong points and sent messengers asking Antigonus for help.
When Antigonus heard that Pyrrhus had treacherously attacked the city, he advanced to the walls and sent a strong force inside to help the Argives. At the same time Areus arrived with a force of 1,000 Cretans and light-armed Spartans. These forces attacked the Gauls in the market place. Pyrrhus, realising that his Gallic troops were hard pressed, now advanced into the city with more troops, but in the narrow streets this soon led to confusion as men got lost and wandered around. The two forces now paused and waited for daylight. When the sun rose, Pyrrhus saw how strong the opposition was and decided the best thing was to retreat. Fearing that the gates would be too narrow for his troops to easily exit the city, he sent a message to his son, Helenus, who was outside with the main body of the army, asking him to break down a section of the walls. The messenger, however, failed to convey his instructions clearly. Misunderstanding what was required, Helenus took the rest of the elephants and some picked troops and advanced into the city to help his father.
With some of his troops trying to get out of the city and others trying to get in, Pyrrhus's army was now thrown into confusion. This was made worse by the elephants. The largest one had fallen across the gateway and was blocking the way, while another elephant, called Nicon, was trying to find its rider. This beast surged against the tide of fugitives, crushing friend and foe alike, until it found its dead master, whereupon it picked him up, placed him on its tusks, and went on the rampage. In this chaos Pyrrhus was struck down by a tile thrown by an old woman and killed by Zopyrus, a soldier of Antigonus.
Halcyoneus, one of Antigonus's sons, heard that Pyrrhus had been killed. Taking the head, which had been cut off by Zopyrus, he rode to where his father was and threw it at his feet. Far from being delighted, Antigonus was angry with his son and struck him, calling him a barbarian and drove him away. He then covered his face with his cloak and burst into tears. The fate of Pyrrhus reminded him all too clearly of the tragic fates of his own grandfather and his father who had suffered similar swings of fortune. He then had Pyrrhus's body cremated with great ceremony.
After the death of Pyrrhus, his whole army and camp surrendered to Antigonus, greatly increasing his power. Later, Halcyoneus discovered Helenus, Pyrrhus's son, disguised in threadbare clothes. He treated him kindly and brought him to his father who was more pleased with his behaviour. "This is better than what you did before, my son," he said, "but why leave him in these clothes which are a disgrace to us now that we know ourselves the victors?" Greeting him courteously, Antigonus treated Helenus as an honoured guest and sent him back to Epirus.
This was not the end of Antigonus' problems with Epirus: shortly after Alexander II, the son of Pyrrhus and his successor as king of Epirus, repeated his father's adventure by conquering Macedonia. However, only a few years later, Alexander was not only expelled from Macedonia by Antigonus' son Demetrius, but he also lost Epirus and had to go into exile in Acarnania. His exile didn't last long, as the Macedonians had to abandon Epirus eventually under pressure from Alexander's allies, the Acarnanians and the Aetolians. Alexander seems to have died about 242 BC, leaving his country under the regency of his wife Olympias who proved anxious to have good relations with Epirus' powerful neighbour, as was sanctioned by the marriage between the regent's daughter Phthia and Antigonus' son and heir Demetrius.
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