As one of the most famous figures in human history, it comes as little surprise that the life of Alexander the Great is tied to several legends of mythic proportions, of which several concern the conqueror’s encounters with sea monsters.

Alexander’s armies traversed much of the known ancient world, leaving their native Macedon far behind them. Over the course of their long campaigns, they encountered many strange sights, some of which may have inspired later myths and legends.

At least two historians, from the ancient and medieval periods, described Alexander the Great and his encounters with sea monsters. The first was Diodorus Sciulus, a Greek historian of the 1st century BC and the Arab scholar Ibn Khaldun of the 14th century AD.

The sea creature at the siege of Tyre, 332 BC

In 323 BC, the intrepid Macedonian king laid siege to Tyre, a well-fortified Phoenician city-state on the coast of the Mediterranean. The city was extremely difficult to penetrate because it was located on an island and was defended by high walls that came right up to the sea.

Nevertheless, it was necessary to capture Tyre to deny the Persians access to a strategically important naval base. Thus, Alexander ordered his engineers to prepare artillery pieces and siege works for an assault on the city.

However, whilst this effort was underway, a strange event in which the army of Alexander the Great encountered a sea monster in the waters around Tyre occurred, according to the writings of Diodorus Siculus.

“As the Macedonian construction came within range of their missiles, portents were sent by the gods to them in their danger,” wrote Diodorus Siculus.  “Out of the sea, a tidal wave tossed a sea monster of incredible size into the midst of the Macedonian operations.”

“It crashed into the mole but did it no harm, remained resting a portion of its body against it for a long time and then swam off into the sea again,” continued the Greek historian. “This strange event threw both sides into superstition, each imagining that the portent signified that Poseidon would come to their aid, for they were swayed by their own interest in the matter.”

A less fantastical explanation for this incident is possible than a mythical sea monster sent by Poseidon. The creature in question may have been a shark, dolphin, whale, or other entirely normal aquatic inhabitant.

Alexander the Great and the sea monsters of Alexandria

The siege of Tyre was not the only time Alexander is said to have encountered a sea monster. According to the Arab scholar Ibn Khaldun, he saw several mythical aquatic beasts in Egypt.

In fact, Ibn Khaldun claimed that sea monsters initially halted the construction of Alexandria until Alexander devised a way to scare them away from the area.

“Sea monsters prevented Alexander from building Alexandria,” wrote the scholar. “He took a wooden container in which a glass box was inserted, and dived in it to the bottom of the sea. There he drew pictures of the devilish monsters he saw.”

According to Ibn Khaldun, “He then had metal effigies of these animals made and set them up opposite the place where building was going on. When the monsters came out and saw the effigies, they fled. Alexander was thus able to complete the building of Alexandria.”

No other woman in Ancient Greek history inspired as much fascination, fear, and controversy as Olympias, the mother of Alexander the Great. She is described as passionate, intelligent, ruthless, and deeply religious. Enemies portrayed her as dangerous and manipulative, while supporters viewed her as a fiercely loyal mother and protector of Alexander’s destiny.

Behind the legends and accusations, however, stood a woman who exercised enormous political influence during one of history’s most transformative periods. Olympias shaped Alexander from childhood, influenced the succession crisis after Philip II’s death, and later played a decisive role in the violent struggles that followed Alexander’s empire.

Her presence loomed over Macedon for decades. Even after Alexander conquered much of the known world, Olympias continued to influence the royal court and the fate of the Argead dynasty.

Alexander the Great’s mother, Olympias, and her Molossian origins

Olympias came from Epirus, a Greek kingdom west of Macedonia. She belonged to the royal Molossian dynasty, which claimed descent from Neoptolemus, the son of Achilles. This heroic ancestry carried enormous symbolic value in the Greek world. Her original name may have been Polyxena or Myrtale. The biographer Plutarch suggests she later adopted the name Olympias after Philip achieved victory at the Olympic Games.

From an early age, Olympias displayed strong religious devotion.They initiated her with mystery cults and ecstatic rituals connected with Dionysus and the mysteries of the Cabeiri to whom she became a high-ranking priestess. These cults emphasized sacred initiation, hidden knowledge, and intense spiritual experiences. Her religious identity later became central to the legends surrounding Alexander’s birth.

The snakes and the divine birth of Alexander

Ancient authors repeatedly connect Olympias with snakes and mystery rituals. Plutarch wrote that Philip once saw a serpent lying beside Olympias while she slept. Legends claimed that she begot Alexander with Zeus through intercourse with snakes. According to later traditions, this event contributed to the belief that Zeus himself fathered Alexander.

These stories shaped Alexander’s image ever since childhood. Olympias appears to have encouraged the belief that her son possessed divine ancestry. Such ideas naturally fit within the heroic traditions of the Greek world in which exceptional rulers often claimed descent from gods. The symbolism of Zeus held enormous political importance. Alexander did not simply present himself as a king but increasingly viewed himself as a chosen figure with a cosmic mission. Of course, Olympias likely played a major role in nurturing this mindset.

Ancient religion did not sharply separate politics from divine legitimacy. A ruler with sacred ancestry possessed more potent authority and prestige. Olympias therefore strengthened Alexander’s position both psychologically and politically. The stories involving snakes also reflected the mystical atmosphere surrounding cults. Serpents symbolized rebirth, divine wisdom, chthonic forces, and sacred power in many Greek traditions. As a priestess connected with such cults, Olympias cultivated an aura of mystery that impressed supporters and frightened enemies.

Olympias’ relationship with Philip II, the father of Alexander the Great

The marriage between Olympias and Philip II began as a political alliance, yet tensions soon emerged between them. Philip married several women during his reign, partly for diplomatic reasons. However, these marriages threatened Alexander’s position as heir. Olympias fiercely defended her son’s claim to the throne and distrusted rival factions within the Macedonian court.

Conflict intensified after Philip married Cleopatra Eurydice, a Macedonian noblewoman. Her marriage resulted in the possibility of a fully Macedonian heir, which endangered Alexander’s succession. Plutarch describes a famous banquet confrontation during which insulted Alexander by implying doubts concerning his legitimacy. The quarrel severely damaged relations within the royal family.

Olympias soon withdrew from Macedon temporarily and returned to Epirus. Alexander also left for a period before reconciliation occurred. These events led to an atmosphere of suspicion and instability that surrounded Philip’s final years.

The assassination of Philip and Alexander’s accession

Philip II passed away in 336 BC after assassination during a public celebration at Aegae. His bodyguard, Pausanias, killed him before guards immediately cut the assassin down. The assassination remains one of antiquity’s great mysteries. Plutarch and the historian Arrian often suspected Olympias of involvement. Some even claimed she honored Pausanias afterward or placed a crown upon his corpse. Other traditions accuse Alexander indirectly as well.

No definitive evidence proves these accusations. However, Olympias clearly benefited politically from Philip’s death because Alexander immediately became king. She acted quickly afterward to eliminate threats against her son’s rule. The geographer Pausanias accuses her of orchestrating brutal acts against Cleopatra Eurydice and her child. Whether entirely accurate or exaggerated by hostile writers, these accounts reveal Olympias’ fierce determination to secure Alexander’s position. In the brutal world of Macedonian succession politics, hesitation often meant destruction.

Even after Alexander launched his campaigns into Asia, Olympias continued influencing Macedonian affairs from afar. Alexander maintained regular correspondence with her and respected her opinions deeply. Both Arrian and Plutarch suggested that Olympias frequently warned him about political rivals and court intrigues. At times, her intense personality resulted in tension with Antipater, whom Alexander left in charge of Macedon during the eastern campaigns. Their rivalry became one of the defining political conflicts of the period.

Olympias viewed herself not merely as the king’s mother but also as guardian of the Argead dynasty and protector of Alexander’s divine mission. Meanwhile, Alexander’s own behavior increasingly reflected the heroic and semi-divine identity cultivated since childhood. His visit to the oracle of Zeus-Ammon in Siwa of Egypt supported these beliefs further when the Egyptian priest proclaimed him as “child of Ammon.” The foundations of this worldview likely originated partly through Olympias’ influence, as previously mentioned.

The chaos after Alexander’s death

Alexander’s death in 323 BC plunged the empire into chaos. Without a clear successor, powerful generals fought for control over the vast territories he conquered. Olympias returned to political life aggressively during this turbulent period, supporting the rights of Alexander IV, Alexander’s young son by Roxana. Olympias viewed him as the legitimate continuation of the Argead dynasty.

In order to defend her grandson’s claim, she entered the brutal wars of the Successors. During this struggle, Olympias captured and executed Philip III Arrhidaeus and his wife Eurydice. These actions shocked many Macedonians and intensified divisions within the kingdom.

Nevertheless, Olympias believed she acted to preserve Alexander’s bloodline and royal legitimacy. Her enemies, however, saw only cruelty and vengeance.

The fall of Olympias

Cassander, one of the most powerful Successors, eventually marched against Olympias. Many Macedonians abandoned her cause as political exhaustion, and civil war consumed the kingdom. After siege and defeat, Olympias surrendered.

Cassander condemned her to death in 316 BC. Plutarch claims that soldiers initially hesitated to execute her because of her royal status and dominant personality. Eventually, however, relatives of her victims carried out the killing. With Olympias’ death, the final collapse of the Argead dynasty was all the more imminent. Soon afterward, Cassander eliminated Alexander IV and Roxana, as well, and thus ended the bloodline of Philip and Alexander.

Olympias remains one of antiquity’s most complex female figures, having shaped Alexander psychologically ever since childhood and having encouraged his belief in divine destiny. She defended his succession fiercely during critical political crises and later fought relentlessly to preserve the dynasty after his death. Without Olympias, Alexander’s rise may have unfolded quite differently.

At the same time, her actions contributed to the violence and instability that destroyed Macedon after Alexander’s empire fragmented. She therefore stands both as creator and destroyer: a queen, priestess, mother, and political strategist whose influence changed the ancient world forever.