Kingdom of Pergamon in the context of "Pergamon"

Hellenistic Greece is the historical period of Ancient Greece following Classical Greece and between the death of Alexander the Great in 323 BC and the annexation of the classical Greek Achaean League heartlands by the Roman Republic. This culminated at the Battle of Corinth in 146 BC, a crushing Roman victory in the Peloponnese that led to the destruction of Corinth and ushered in the period of Roman Greece. Hellenistic Greece's definitive end was with the Battle of Actium in 31 BC, when Octavian defeated Ptolemaic queen Cleopatra VII and Mark Antony, the next year taking over Alexandria, the last great center of Hellenistic Greece.

The Hellenistic period began with the wars of the Diadochi, armed contests among the former generals of Alexander the Great to carve up his empire in Europe, Asia, and North Africa. The wars lasted until 275 BC, witnessing the fall of both the Argead and Antipatrid dynasties of Macedonia in favor of the Antigonid dynasty. The era was also marked by successive wars between the Kingdom of Macedonia, the kingdom of Epirus, the Aetolian League, Achaean League, Sparta, Rhodes, kingdom of Pergamum as well as the Seleucid and Ptolemaic empires.

The Battle of Magnesia took place in either December 190 or January 189 BC. It was fought as part of the Roman–Seleucid War, pitting forces of the Roman Republic led by the consul Lucius Cornelius Scipio Asiaticus and the allied Kingdom of Pergamon under Eumenes II against a Seleucid army of Antiochus III the Great. The two armies initially camped northeast of Magnesia ad Sipylum in Asia Minor (modern-day Manisa, Turkey), attempting to provoke each other into a battle on favorable terrain for several days.

When the battle finally began, Eumenes managed to throw the Seleucid left flank into disarray. While Antiochus' cavalry overpowered his adversaries on the right flank of the battlefield, his army's center collapsed before he could reinforce it. Modern estimates give 10,000 dead for the Seleucids and 5,000 killed for the Romans. The battle resulted in a decisive Roman-Pergamene victory, which led to the Treaty of Apamea that ended Seleucid domination in Asia Minor.

The Treaty of Apamea was a peace treaty conducted in 188 BC between the Roman Republic and Antiochus III, ruler of the Seleucid Empire. It ended the Roman–Seleucid War. The treaty took place after Roman victories at the Battle of Thermopylae (in 191 BC), the Battle of Magnesia (in 190 BC), and after Roman and Rhodian naval victories over the Seleucid navy.

The Pergamon Altar (Ancient Greek: Βωμός τῆς Περγάμου) was a monumental construction built during the reign of the Ancient Greek King Eumenes II of the Pergamon Empire in the first half of the 2nd century BC on one of the terraces of the acropolis of Pergamon in Asia Minor (modern-day Turkey). It was described as one of the Seven Wonders of the Ancient World by three known classical lists.

The structure was 35.74 metres (117 ft 3 in) wide and 33.4 metres (109 ft 7 in) deep; the front stairway alone was almost 20 metres (66 ft) wide. The base was decorated with a frieze in high relief showing the battle between the Giants and the Olympian gods known as the Gigantomachy. There was a second, smaller and less well-preserved high relief frieze on the inner court walls which surrounded the actual fire altar on the upper level of the structure at the top of the stairs. In a set of consecutive scenes, it depicts events from the life of Telephus, legendary founder of the city of Pergamon and son of the hero Heracles and Auge, one of Tegean king Aleus's daughters.

Attalus I (Ancient Greek: Ἄτταλος 'Attalos'), surnamed Soter (Greek: Σωτήρ, 'Savior'; 269–197 BC), was the ruler of the Greek polis of Pergamon (modern-day Bergama, Turkey) and the larger Pergamene Kingdom from 241 BC to 197 BC. He was the adopted son of King Eumenes I, whom he succeeded, and the first of the Attalid dynasty to assume the title of king, sometime around 240 to 235 BC. He was the son of Attalus and his wife Antiochis.

Attalus won an important victory, the Battle of the Caecus River, over the Galatians, a group of migratory Celtic tribes from Thrace, who had been plundering and exacting tribute throughout most of Asia Minor for more than a generation. The victory was celebrated with a triumphal monument at Pergamon (The Dying Gaul) and Attalus taking the surname "Soter" and the title of king. He participated in the first and second Macedonian Wars against Philip V of Macedon as a loyal ally of the Roman Republic, although Pergamene participation was ultimately rather minor in these wars. He conducted numerous naval operations throughout the Aegean, gained the island of Aegina for Pergamon during the first war and Andros during the second, twice narrowly escaping capture at the hands of Philip V. During his reign, Pergamon also repeatedly struggled with the neighboring Seleucid Empire to the east, resulting in both successes and setbacks.

Alexander I Theopator Euergetes, surnamed Balas (Ancient Greek: Ἀλέξανδρος Βάλας, romanized: Alexandros Balas), was the ruler of the Seleucid Empire from 150 BC to August 145 BC. Picked from obscurity and supported by the neighboring Roman-allied Kingdom of Pergamon, Alexander landed in Phoenicia in 152 BC and started a civil war against Seleucid King Demetrius I Soter. Backed by mercenaries and factions of the Seleucid Empire unhappy with the existing government, he defeated Demetrius and took the crown in 150 BC. He married the princess Cleopatra Thea to seal an alliance with the neighboring Ptolemaic kingdom. His reign saw the steady retreat of the Seleucid Empire's eastern border, with important eastern satrapies such as Media being lost to the nascent Parthian Empire. In 147 BC, Demetrius II Nicator, the young son of Demetrius I, began a campaign to overthrow Balas, and civil war resumed. Alexander's ally, Ptolemaic king Ptolemy VI Philometor, moved troops into Coele-Syria to support Alexander, but then switched sides and threw his support behind Demetrius II. At the Battle of the Oenoparus River in Syria, he was defeated by Ptolemy VI and he died shortly afterward.

The Battle of the Caecus River or Battle of the Kaikos was a battle between an army of the Kingdom of Pergamon commanded by Attalus I, and the Galatian tribes who resided in Anatolia (Asia Minor). The battle took place near the source of the Caecus River (Ancient Greek: Κάϊκος, romanized: Káïkos) and resulted in a victory for the Kingdom of Pergamon.

The exact date of the battle is unknown, but it seems to have taken place early in the reign of Attalus I. Attalus I celebrated it as a great victory and as establishing his legitimacy as ruler early in his reign, and used it as a reason to dub himself Soter, Savior, and to take the title of basileus, king. R. E. Allen suggests the early 230s (238 to 235 BC) as the best guess of the date.