Early life and career under Lysimachus 
He was born in Tieium (Greek: Tieion), a small town which is situated in the geographical region of Pontus Euxinus on the Black Sea coast of Anatolia between Bithynia to the west and Paphlagonia to the east. His father Attalus (Greek: Attalos) was Greek (perhaps from Macedon) and his mother Boa was Paphlagonian.
After the death of Alexander the Great in 323 BC, Philetaerus became embroiled in the struggle for supremacy, called the Wars of the Diadochi (diadochi means "successors" in Greek) between Alexander's regional governors, Antigonus in Phrygia, Lysimachus in Thrace and Seleucus in Babylonia (among others). Philetaerus served first under Antigonus. He then shifted his allegiance to Lysimachus (ruler of Pergamon from 323 BC to 281 BC), who, after Antigonus was killed at the Battle of Ipsus in 301 BC, made Philetaerus commander of Pergamon, where Lysimachus kept a treasury of nine thousand talents of silver.
Ruler of Pergamon 
Philetaerus served Lysimachus until 282 BC, when perhaps because of conflicts involving the court intrigues of Arsinoë, Lysimachus' third wife, Philetaerus deserted Lysimachus, offering himself and the important fortress of Pergamon, along with its treasury to Seleucus, who subsequently defeated and killed Lysimachus at the Battle of Corupedium in 281 BC. Seleucus himself was killed by Ptolemy Ceraunus, a brother of Arsinoë at Lysimachia a few months later.
Though nominally under Seleucid control, Philetaerus, especially after the death of Seleucus, had considerable autonomy and was able with the help of his considerable wealth to increase his power and influence beyond Pergamon. There are numerous records of Philetaerus as benefactor to neighboring cities and temples, including the temples at Delphi and Delos. He also contributed troops, money and food to the city of Cyzicus for defense against the invading Gauls. As a result Philetaerus gained prestige and goodwill for himself and his family.
During his nearly forty year rule, he constructed on the acropolis of Pergamon, the temple of Demeter, and the temple of Athena (Pergamon's patron deity), and Pergamon's first palace and he added considerably to the city's fortifications.
Philetaerus was a eunuch, though scholars differ on the reason for his castration. Attalus I, the first Attalid king of Pergamon, explained that when Philetaerus was a baby, he was brought into a crowd where he was pressed upon and his testicles were crushed.
- "Philetaerus of Tieium, was a eunuch from boyhood; for it came to pass at a certain burial, when a spectacle was being given at which many people were present, that the nurse who was carrying Philetaerus, still an infant, was caught in the crowd and pressed so hard that the child was incapacitated. He was a eunuch, therefore, but he was well trained and proved worthy of this trust."
Philetaerus never married and, since he was a eunuch, had no children. He adopted his nephew Eumenes I (the son of Philetaerus' brother also named Eumenes), who succeeded him as ruler of Pergamon, upon his death in 263 BC. With the exception of Eumenes II, all future Attalid rulers depicted the bust of Philetaerus on their coins, paying tribute to the founder of their dynasty.
- Renée Dreyfus, Ellen Schraudolph (1996). Pergamon: The Telephos Frieze from the Great Altar. University of Texas Press. p. 24. ISBN 0-88401-091-0. "Philetairos of Tios on the Black Sea, son of a Greek father and a Paphlagonian mother, a high-ranking officer in the army of King Lysimachos and also his confidant, was the actual founder of Pergamon."
- Strabo, 12.3.8.
- Hansen, p. 15.
- Strabo, 13.4.1.
- Pausanias, 1.10.3, 4; Strabo, 13.4.1.
- Pausanias, 1.10.5.
- Junianus Justinus, 17.2; Strabo, 13.4.1.
- For a more detailed account of the benefactions of Philetaerus, including sources, see Hansen, pp. 18–19; see also Strabo, 13.4.1.
- Hansen, pp. 17, 18.
- Both Strabo, 13.4.1 and Pausanias, 1.8.1 state that he was a eunuch, according to Strabo, as the result of a childhood accident.
- Strabo, 13.4.2.
- Hansen, Esther V. (1971). The Attalids of Pergamon. Ithaca, New York: Cornell University Press; London: Cornell University Press Ltd. ISBN 0-8014-0615-3.
- Kosmetatou, Elizabeth (2003) "The Attalids of Pergamon," in Andrew Erskine, ed., A Companion to the Hellenistic World. Oxford: Blackwell: pp. 159–174. ISBN 1-4051-3278-7. text
- Junianus Justinus, Epitome of the Philippic History of Pompeius Trogus, translated, with Footnotes, by the Rev. John Selby Watson; London: Henry G. Bohn, York Street, Convent Garden (1853).
- Pausanias, Description of Greece, Books I-II, (Loeb Classical Library) translated by W. H. S. Jones; Cambridge, Massachusetts: Harvard University Press; London, William Heinemann Ltd. (1918) ISBN 0-674-99104-4.
- Strabo, Geography, (Loeb Classical Library) translated by Horace Leonard Jones; Cambridge, Massachusetts: Harvard University Press; London: William Heinemann, Ltd. (1924) Books 10-12, ISBN 0-674-99233-4; Books 13-14, ISBN 0-674-99246-6.
|Ruler of Pergamon