Lagus from Eordaea was the father, or reputed father, of Ptolemy

Ptolemy I Soter

Ptolemy I Soter I , also known as Ptolemy Lagides, c. 367 BC – c. 283 BC, was a Macedonian general under Alexander the Great, who became ruler of Egypt and founder of both the Ptolemaic Kingdom and the Ptolemaic Dynasty...

, the founder of the Ptolemaic dynasty

Ptolemaic dynasty

The Ptolemaic dynasty, was a Macedonian Greek royal family which ruled the Ptolemaic Empire in Egypt during the Hellenistic period. Their rule lasted for 275 years, from 305 BC to 30 BC...

. He married Arsinoe

Arsinoe of Macedonia

Arsinoe of Macedonia was the mother of Ptolemy I Soter , king of Egypt. She was originally a concubine of Philip II, king of Macedon, and it is said she was given by Philip to Lagus, a Macedonian, while she was pregnant with Ptolemy...

, a concubine of Philip II

Philip II of Macedon

Philip II of Macedon "friend" + ἵππος "horse" — transliterated ; 382 – 336 BC), was a king of Macedon from 359 BC until his assassination in 336 BC. He was the father of Alexander the Great and Philip III.-Biography:...

, king of Macedon

Macedon

Macedonia or Macedon was an ancient kingdom, centered in the northeastern part of the Greek peninsula, bordered by Epirus to the west, Paeonia to the north, the region of Thrace to the east and Thessaly to the south....

, who was said to have been pregnant at the time of their marriage, on which account it is told that the Macedonians generally looked upon Ptolemy as in reality the son of Philip; but it is possible that this is a later myth fabricated to glorify the Ptolemaic dynasty

Ptolemaic dynasty

The Ptolemaic dynasty, was a Macedonian Greek royal family which ruled the Ptolemaic Empire in Egypt during the Hellenistic period. Their rule lasted for 275 years, from 305 BC to 30 BC...

. From an anecdote recorded by Plutarch

Plutarch

Plutarch then named, on his becoming a Roman citizen, Lucius Mestrius Plutarchus , c. 46 – 120 AD, was a Greek historian, biographer, essayist, and Middle Platonist known primarily for his Parallel Lives and Moralia...

, it is clear that Lagus was a man of obscure birth; hence, when Theocritus

Theocritus

Theocritus , the creator of ancient Greek bucolic poetry, flourished in the 3rd century BC.-Life:Little is known of Theocritus beyond what can be inferred from his writings. We must, however, handle these with some caution, since some of the poems commonly attributed to him have little claim to...

calls Ptolemy a descendant of Heracles

Heracles

Heracles ,born Alcaeus or Alcides , was a divine hero in Greek mythology, the son of Zeus and Alcmene, foster son of Amphitryon and great-grandson of Perseus...

, he probably means to represent him as the son of Philip. Lagus is believed by some to have subsequently married Antigone

Antigone of Macedonia

Antigone was a Greek Macedonian noblewoman that lived in the 4th century BC.She was the child born to the nobleman Cassander by unnamed mother. Antigone was a relative to the powerful Regent Antipater as she was his niece...

, niece of Antipater

Antipater

Antipater was a Macedonian general and a supporter of kings Philip II of Macedon and Alexander the Great. In 320 BC, he became Regent of all of Alexander's Empire. Antipater was one of the sons of a Macedonian nobleman called Iollas or Iolaus and his family were distant collateral relatives to the...

, by whom he became the father of Berenice

Berenice I of Egypt

Berenice I was a Greek Macedonian noblewoman and through her marriage to Ptolemy I Soter, became the first Queen of the Ptolemaic dynasty of Egypt.-Family:...

, afterwards the wife of Ptolemy, but this is based on a misreading of a corrupt scholium; her father's name was almost certainly Magas

Magas of Macedon

Magas was a Greek Macedonian nobleman that lived in the 4th century BC.Magas was a local nobleman from obscure origins and was from Eordeaea. Little is known on his life....

.

Lagus (Lykaionike)

Lagus (son of Ptolemy) winner in Synoris Arcadian Lykaia

Lykaia

In Ancient Greece, the Lykaia was an archaic festival with a secret ritual on the slopes of Mount Lykaion , the tallest peak in rustic Arcadia. The rituals and myths of this primitive rite of passage centered upon an ancient threat of cannibalism and the possibility of a werewolf transformation...

308 BC may be a relative of Lagus family.