Antigonid in the context of "Antigonus II Gonatas"

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.

Ptolemy V Epiphanes Eucharistus (Greek: Πτολεμαῖος Ἐπιφανής Εὐχάριστος, Ptolemaĩos Epiphanḗs Eukháristos "Ptolemy the Manifest, the Beneficent"; 9 October 210–September 180 BC) was the King of Ptolemaic Egypt from July or August 204 BC until his death in 180 BC.

Ptolemy V, the son of Ptolemy IV and Arsinoe III, inherited the throne at the age of five when his parents died in suspicious circumstances. The new regent, Agathocles, was widely reviled and was toppled by a revolution in 202 BC, but the series of regents who followed proved incompetent and the kingdom was paralysed. The Seleucid king Antiochus III and the Antigonid king Philip V took advantage of the kingdom's weakness to begin the Fifth Syrian War (202–196 BC), in which the Ptolemies lost all their territories in Asia Minor and the Levant, as well as most of their influence in the Aegean Sea. Simultaneously, Ptolemy V faced a widespread Egyptian revolt (206–185 BC) led by the self-proclaimed pharaohs Horwennefer and Ankhwennefer, which resulted in the loss of most of Upper Egypt and parts of Lower Egypt as well.

The 2nd century BC started the first day of 200 BC and ended the last day of 101 BC. It is considered part of the Classical era, although depending on the region being studied, other terms may be more suitable. It is also considered to be the end of the Axial Age. In the context of the Eastern Mediterranean, it is the mid-point of the Hellenistic period.

Fresh from its victories in the Second Punic War, the Roman Republic continued its expansion in the western Mediterranean, campaigning in the Iberian Peninsula throughout the century and annexing the North African coast after the destruction of the city of Carthage at the end of the Third Punic War. They became the dominant force in the Aegean by destroying Antigonid Macedonia in the Macedonian Wars and Corinth in the Achaean War. The Hellenistic kingdoms of Ptolemaic Egypt and Attalid Pergamon entered into subordinate relationships with the Romans – Pergamon was eventually annexed. The end of the century witnessed the evolution of the Roman army from a citizen army into a voluntary professional force, which later scholars would misattribute to putative reforms by noted general and statesman Gaius Marius (the so-called Marian Reforms).

Diogenes was the Macedonian commander of the Antigonid garrison in Piraeus in the third quarter of the third century BC.

In 229 BC, he abandoned the garrison and returned Piraeus to the Athenians in exchange for a payment of 150 talents, making Athens free from foreign military occupation for the first time in 65 years.

The League of the Islanders (Ancient Greek: τὸ κοινὸν τῶν νησιωτῶν, romanized: to koinon tōn nēsiōtōn) or Nesiotic League was a federal league (koinon) of ancient Greek city-states encompassing the Cyclades islands in the Aegean Sea. Organized under the auspices of Antigonus Monophthalmus in c. 314/3 BC, it remained under Antigonid control until c. 287 BC. It then passed under the aegis of the Ptolemaic Kingdom until Ptolemaic control over the central Aegean collapsed and the League was dissolved sometime in the mid-3rd century BC. The Cycladic islands reverted to independence, except for a few that passed under Macedonian control. The league was re-established ("Second Nesiotic League") under the leadership of Rhodes in c. 200 BC, and survived until c. 167 BC.