Battle of Pydna: Romans under Lucius Aemilius Paullus defeat Macedonian King Perseus who surrenders after the battle, ending the Third Macedonian War.

The Battle of Pydna took place in 168 BC between Rome and Macedon during the Third Macedonian War. The battle saw the further ascendancy of Rome in the Hellenistic world and the end of the Antigonid line of kings, whose power traced back to Alexander the Great. The battle is also considered to be a victory of the Roman legion's manipular system's flexibility over the Macedonian phalanx's rigidity.

The Roman Republic was the era of classical Roman civilisation beginning with the overthrow of the Roman Kingdom and ending in 27 BC with the establishment of the Roman Empire following the War of Actium. During this period, Rome's control expanded from the city's immediate surroundings to hegemony over the entire Mediterranean world.

Lucius Aemilius Paullus Macedonicus was a consul of the Roman Republic, as well as a general, who conquered the kingdom of Macedonia during the Third Macedonian War.

Macedonia, also called Macedon, was an ancient kingdom on the periphery of Archaic and Classical Greece, which later became the dominant state of Hellenistic Greece. The kingdom was founded and initially ruled by the royal Argead dynasty, which was followed by the Antipatrid and Antigonid dynasties. Home to the ancient Macedonians, the earliest kingdom was centered on the northeastern part of the Greek peninsula, and bordered by Epirus to the southwest, Illyria to the northwest, Paeonia to the north, Thrace to the east and Thessaly to the south.

Perseus was king of the ancient Greek kingdom of Macedon from 179 until 168 BC. He is widely regarded as the last king of Macedonia and the last ruler from the Antigonid Dynasty, as his defeat by Rome at the Battle of Pydna during the Third Macedonian War effectively ended Macedonia as an independent political entity.

The Third Macedonian War was a war fought between the Roman Republic and King Perseus of Macedon. In 179 BC, King Philip V of Macedon died and was succeeded by his ambitious son Perseus. He was anti-Roman and stirred anti-Roman feelings around Macedonia. In 172 BC, a Roman commission visited Perseus and required of him concessions which meant the extinction of his independence. Upon his refusal to comply with the demands they returned home and Rome declared war.

June 22 is the 173rd day of the year in the Gregorian calendar; 192 days remain until the end of the year.