Documentary and Monetary Evidence: The Babylonian Diary and Coinage

Two different ways of remembering Alexander

A written record and a coin can answer different historical questions. The Babylonian Astronomical Diary records Alexander’s victory over Darius III at Gaugamela and his arrival in Babylon in 331 BC. The silver tetradrachms commissioned by Lysimachus and Ptolemy I present selected images of Alexander. Studying them together helps us distinguish evidence about events from evidence about how a ruler’s reputation was used.

These are archaeological sources, but that does not make them automatically impartial. A tablet can preserve a particular community’s perspective; a coin’s design can communicate a political message.

The Babylonian Diary: astronomy alongside conquest

The prescribed diary survives on two tablets which do not join, British Museum 36761 and 36390. Much is missing: the historical account occupies the surviving left-hand portion of a larger tablet, while only the upper half of the obverse of the other tablet remains. The surviving writing is clear, so the main difficulty is missing material rather than generally unreadable writing.

Its entries cover the Babylonian months Elul, 8 September–7 October, and Tishri, 8 October–6 November 331 BC. Astronomical observations include a lunar eclipse and the winds during it. Historical events appear alongside these observations, giving Alexander’s conquest a place within a Babylonian record rather than a Greek account centred on his achievements.

The names require interpretation. “The king” means Darius III, whereas “the king of the world” means Alexander. The diary also uses older geographical names: “Hanaeans” refers here to Macedonians, while “Gutians” is an old designation for people east of the Tigris. These terms reflect Babylonian naming conventions, not the modern names of Alexander’s forces.

What the Diary tells us about Gaugamela

The diary records panic in Darius’ camp on 18 September 331 BC. It then places the battle on 1 October 331 BC, describing the opposing armies fighting and a heavy defeat of Darius’ troops. Particularly important is its statement that Darius’ troops deserted him and fled.

This is useful evidence for the collapse of Persian resistance. It draws attention to the breakdown of loyalty around Darius, rather than explaining victory entirely through Alexander’s personal bravery. It does not, however, provide a detailed reconstruction of battlefield movements.

Comparison strengthens an evaluation. Arrian also describes Alexander’s victory and Darius’ escape, but gives an extended narrative, casualty totals and the fulfilment of Aristander’s prophecy following an eclipse. The Babylonian record supports the broad outcome without independently confirming all those details. Agreement about victory is not the same as agreement about every aspect of a battle.

Entry into Babylon: authority and local religion

The reverse moves from military defeat to Alexander’s arrival in Babylon. It records an order associated with 18 October 331 BC, including the statement “Into your houses I shall not enter.” This suggests an attempt to reassure the population about the behaviour of the incoming ruler.

Other entries concern Esagila, a Babylonian temple. The reconstructed passages describe its restoration, contributions to its treasury and Greeks entering and prostrating themselves. An entry also refers to sacrifice. Together, these passages suggest that relations with Babylonian religious institutions mattered in establishing the new ruler’s authority.

The strength of each conclusion depends on the wording’s survival. Square brackets mark restored or supplied material, and ellipses mark gaps. Several restorations concerning Esagila are speculative. Alexander’s plan to rebuild the temple is also known from Arrian, and Babylonian payments for clearing its debris are known separately; this supports the context, but does not turn every reconstructed word into certain evidence.

The diary is therefore valuable for its Babylonian perspective, dated entries and account of defeat and arrival. Its limitations are equally specific: physical damage interrupts the account, some wording is reconstructed, and its brief entries cannot explain every motive or military decision. The title “king of the world” shows how Alexander is designated in the text, not that everyone willingly accepted his rule.

Lysimachus’ coin: Alexander’s divinity serving another king

Examine both faces of the silver tetradrachm of Lysimachus, British Museum 1919,0820.1, on page 53 of the OCR prescribed sources booklet. The photographs show the two faces side by side.

On the left, the obverse shows Alexander’s head in profile. Look for the curving ram’s horn near his ear. This associates him with the Egyptian god Ammon, understood by Greeks as equivalent to Zeus: Zeus Ammon. At Siwa, the priests had greeted Alexander as Ammon’s son and Egypt’s rightful pharaoh. The horn therefore conveys divine status rather than simply decorating the portrait.

On the right, the reverse shows Athena seated beside a shield. Its Greek inscription means “Of King Lysimachus”. The combination is revealing: Alexander supplies the prestigious portrait, but Lysimachus identifies himself as the king issuing the money.

Alexander died in 323 BC, after which his generals competed over his empire and legacy. Lysimachus, who reigned as king from 305 to 281 BC, controlled Thrace and later parts of western Asia Minor. This coin was minted at Lampsacus, and belongs to his coinage produced after about 305 BC. It is not a coin commissioned by Alexander himself.

Lysimachus was not a blood-relative of Alexander’s royal family. Association with the deified conqueror offered another way to claim legitimacy. The design connected Lysimachus’ authority with Alexander’s reputation and, through Alexander, with the gods.

Ptolemy I’s coin: conquest and authority in Egypt

Examine the silver tetradrachm minted by Ptolemy I, British Museum 1987,0649.508, on page 54 of the same booklet. Again, the obverse is on the left and the reverse on the right.

The distinctive feature is Alexander’s elephant-scalp headdress. Look above and around the forehead for the animal-shaped covering, rather than mistaking it for ordinary hair or a helmet. The reverse shows a standing armed figure carrying a shield and spear, contrasting with the seated Athena on Lysimachus’ coin.

This particular coin was minted in Alexandria, Egypt, about 306 BC, well after Alexander’s death. Ptolemy had been one of Alexander’s generals. Following Alexander’s death in 323 BC, he became satrap, or governor, of Egypt and later declared himself king. His use of Alexander’s portrait belongs to the competition among the Successors to establish their own authority.

The elephant cap recalls Alexander’s military triumphs, particularly his campaigns in the Indian subcontinent, where he defeated Porus at the Hydaspes. It turns the portrait into an image of an exceptional conqueror, rather than a record of ordinary clothing. The portrait also carries ram’s horns, associating Alexander with Zeus Ammon and his claimed divine status. Together, these symbols combine military achievement with divinity.

Ptolemy used the cult of Alexander—religious veneration of the dead conqueror—to strengthen his own legitimacy as ruler of Egypt. The coin makes that connection visible: Alexander’s fame and divine associations could lend prestige to the ruler issuing money in his image. This does not mean Ptolemy inherited Alexander’s entire empire or that every user of the coin accepted his claim.

Ptolemy’s portrait, like Lysimachus’ horned portrait, is therefore not a neutral record of Alexander’s everyday appearance. The important distinction is between Alexander, the person represented, and Ptolemy I, the ruler commissioning the representation. Both Successors drew on Alexander’s reputation, but Ptolemy’s elephant headdress gives military conquest particular prominence.

Reading coins as historical evidence

A useful interpretation moves through three stages: identify a visible feature, explain its associations, then connect it to the issuer’s interests. For Lysimachus’ coin, the horn links Alexander to Ammon; the royal inscription identifies Lysimachus; their combination suggests a claim to authority through association with a divine Alexander. For Ptolemy’s coin, the elephant headdress recalls Alexander’s conquests, while the use of his portrait helps Ptolemy claim legitimacy in Egypt.

Coins are especially useful for studying deliberate public representation because portraits, symbols and inscriptions were selected for an object used as money. They are less useful for proving Alexander’s actual appearance, divine ancestry or the population’s response. A ruler’s intended message and its successful acceptance are different things.