by Mary Harrsch © 2026
This is one of the finest surviving examples of a Greek kerykeion — the iconic staff of Hermes, messenger of the Olympians and guide of souls between the worlds of the living and the dead that I photographed at the Dallas Museum of Art.
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Bronze kerykeion (caduceus), Greek, early 5th century BCE. Dallas Museum of Art. In Greek art, this staff identifies Hermes—herald, traveler's patron, and guide of souls. But its central motif—two serpents twisting around a rod—appears on Mesopotamian cylinder seals and ritual objects more than a millennium earlier, carried by the Sumerian snake-god Ningishzida. Is this visual inheritance or independent invention? The question remains open, but the parallel is impossible to ignore. Photograph by the Author. |
Beneath the head of each serpent, the bronze-smith has rendered a distinct wattle or beard—a stylized, fleshy protrusion. This is not a naturalistic detail. No snake native to Greece (not the adder, the rat snake, nor the Aesculapian snake venerated in the healing cults of Asclepius) possesses a beard. Greek artists were perfectly capable of naturalistic rendering when they chose to be. The presence of this artificial feature therefore signals something else: the artist was following an iconographic convention, not observing nature.
That convention—marking a serpent as divine, powerful, or chthonic by giving it a beard or human-like head—originated not in Greece but in Mesopotamia, where the underworld god Ningishzida was depicted as a human-headed serpent or as the horned, bearded Bašmu dragon. The beard on this Hermes staff is a fossil of that forgotten hybrid form, a small but telling clue that the kerykeion's visual language traveled westward across centuries and cultures before a Greek bronze-caster shaped this staff in the early 5th century BCE.
The kerykeion (its Latin equivalent being caduceus) appears in Greek art from the Early Archaic period, carried most often by Hermes, though it is occasionally held by Iris — the messenger of Hera — and by Nike in her role as herald of victory. Its origins remain debated; the staff's source may ultimately lie in the ancient Near East.
The cylinder seal evidence
The most concrete argument comes from material culture. William Hayes Ward (1910) discovered that symbols closely resembling the classical caduceus appear on Mesopotamian cylinder seals, and suggested the symbol originated somewhere in the 3rd millennium BCE, proposing it as a plausible source for the Greek form. These seals predate the earliest Greek representations by millennia, which gives the diffusionist argument its chronological backbone.
Ningishzida and the divine prototype
The more ambitious theoretical claim involves the Sumerian underworld deity Ningishzida. Ningishzida was a messenger god who dwelled in the Underworld for part of the year, and the symbol for this underworld messenger was two entwined serpents on a staff — the same configuration as the kerykeion. Some scholars have proposed that the Greeks adopted this symbol from the Near Eastern context for their own messenger god Hermes, who shares the same chthonic, psychopomp functions.
Ningishzida makes his first appearance in the Fara god list from the Early Dynastic III period, dated to approximately 2600–2350 BCE. This is our earliest documented evidence of the deity by name, though of course the absence of earlier written records doesn't mean the cult didn't predate that.
His origins as a tree god
Although Ningishzida was a power of the netherworld, he appears to have originally been a tree god — his name apparently meaning "Lord Productive Tree," and he was probably the god of winding tree roots, since he was originally represented in serpent form. The snake-and-staff iconography thus likely grew organically out of this root-as-serpent conceptualization of an arboreal deity, rather than being a purely abstract symbol from the outset.
His nature and cult spread
His primary cult center was Gishbanda, a settlement situated between Lagash and Ur in southern Mesopotamia. Ningishzida, like his father Ninazu, is a chthonic deity associated with vegetation, growth and decay, snakes and demons. Associated with his role in agriculture, he was said to travel to the underworld at the time of the death of vegetation — in Mesopotamia, mid-summer to mid-winter.
The Gudea connection and the key visual evidence
A.L. Frothingham extended Ward's argument in 1916, proposing that the Greek god Hermes himself derived from an "Oriental deity of Babylonian extraction"—specifically, the snake god Ningishzida, whose earliest form was as a "messenger" deity.
Ningishzida as "a messenger god" is a slight oversimplification. His primary roles were as a chthonic vegetation deity and "chair-bearer of the underworld." The messenger-god parallel to Hermes is an inference drawn from his appearance as a doorkeeper in the Adapa myth, not a core title.
The long tail of the cult
Ningishzida's worship persisted all the way into the reign of the Persian king Darius I at Uruk, indicating that his cult endured through multiple historical periods.
Walter Burkert, one of the 20th century's leading scholars of Greek religion, characterized the entwined copulating serpents as not just a borrowed symbol but reference to a specific visual concept — paired serpents in a sexual or entwined posture. Burkert privileges cuneiform literature as a source of literary transmission in light of the continuous routes of contact between Mesopotamia and Greek speakers, with these contacts reaching an apogee in the 8th and 7th centuries BCE. He tracks the migrant craftsmen who brought the Greeks new techniques and designs, the wandering seers and healers teaching magic and medicine, and the important Greek borrowings from Near Eastern poetry.
So from roughly 2600 BCE to at least the late 6th century BCE, this deity with his entwined-serpent iconography was continuously present in Mesopotamian religious life — a timeframe that comfortably predates and overlaps with the period of intensifying Greek contact with the Near East in the Archaic period.
The upshot for the kerykeion question: the deity and his snake-staff symbolism were circulating in Mesopotamia for well over a millennium before the Greek kerykeion crystallizes in the Archaic period, which is why the iconographic parallel carries real weight.
The pre-anthropomorphic argument
There is also a more structural argument about how divine symbolism evolves. It has been argued that the staff or wand entwined by two snakes was itself representing a god in the pre-anthropomorphic era — meaning the staff was Hermes, before the Greeks developed a fully human-figured deity. Like the herm or Priapus, it would thus be a precursor to the anthropomorphic Hermes of the classical period.
The dissenting view
It's worth noting this isn't a closed question. Lewis Richard Farnell (1909) argued that the two snakes simply developed out of ribbon ornaments on a herald's shepherd's crook, with no need for Near Eastern derivation at all. This purely Hellenic-origin view has fallen out of favor, but it reminds us that the Near Eastern connection, while widely accepted, rests largely on iconographic analogy and functional parallel rather than a documented transmission route.
The case rests on the very early Mesopotamian parallels, the striking similarities to Ningishzida's symbolism and role, the serpent's deep roots in Near Eastern religious iconography more broadly, and the prestige of Burkert's endorsement — but it remains an inference rather than a proven chain of transmission.
The development of this object reflects close trading relationships between Greece and the ancient Near East.
The Orientalizing Period
The critical window is what art historians call the Orientalizing Period, roughly 750–580 BCE. This is the period when art of the Eastern Mediterranean and the Ancient Near East heavily influenced nearby Mediterranean cultures, most notably Archaic Greece. The main sources of influence were Egypt, Phoenicia, Syria, and Assyria. The DMA kerykeion, dated to the early 5th century BCE, sits at the tail end of this intensive exchange period, which gives the transmission hypothesis real chronological plausibility.
Al Mina as a key conduit
One of the most important physical nodes in this network was the trading settlement of Al Mina on the Syrian coast. Modern research has shown that Al Mina was a significant eastern trading settlement with strong Greek connections dating back to around 825 BCE, and later work has considered it key to understanding the role of early Greeks in the east at the outset of the Orientalizing period. This gave Greeks direct, sustained access to a Levantine milieu that was itself deeply embedded in Mesopotamian cultural traditions.
The Phoenician intermediary problem
One important nuance is that the transmission was rarely direct. The Phoenicians were the great middlemen of the ancient Mediterranean, and much of what the Greeks received as "Near Eastern" came filtered through Phoenician commercial and cultural networks. This means the kerykeion iconography need not have traveled directly from a Sumerian temple context to a Greek bronze-caster — it could have passed through several layers of transmission, accumulating new associations along the way, which also makes it harder to prove a clean line of descent.
The mercenary connection
There's also a less discussed but significant human channel: during this period, the Assyrians advanced along the Mediterranean coast accompanied by Greek and Carian mercenaries, who were also active in the armies of Psamtik I in Egypt. Greek soldiers serving in Near Eastern armies would have had direct exposure to Mesopotamian religious iconography in ways that pure trade alone couldn't replicate.
So, the development of the kerykeion fits neatly within a much broader pattern of sustained, multi-channel contact between the Greek world and Mesopotamia across the 9th through 6th centuries BCE. The staff was made right at the moment when that exchange was at its most intensive.
However, amicable trade relations did not prevent political conflict. Prior to the 5th century, Greek elites spent money imitating eastern / Lydian dress and buying Persian art and goods. That commercial relationship didn't dissolve — it coexisted with, and was eventually overshadowed by, political confrontation driven by entirely different forces.
The structural trigger: Cyrus and the Ionian Greeks
The animosity didn't arise from trade grievances. It arose from imperial expansion colliding with Greek political autonomy. When Cyrus overthrew the Lydian kingdom of Croesus in 546 BCE, the Greek cities of Asia Minor found themselves under the rule of the Great King — a monarch absolute in religion, politics, and war, and the antithesis of city-state liberalism. This is the key structural fault line: Persian imperial governance was fundamentally incompatible with the Greek polis model of civic self-rule.
After the resulting Ionian Revolt and Persian Wars, Greek writers like Aeschylus and Herodotus actively forged a civilizational contrast between Greek freedom and Persian despotism that served Athenian political purposes. Unfortunately, this schism between East and West has continued into modern times.
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