Oracle of Delphi: The Pythia and the Sanctuary of Apollo

The Oracle of Delphi was the most famous and respected oracle of the ancient Greek world, located at the sanctuary of Apollo on the slopes of Mount Parnassus in central Greece. From around the 8th century BC until the late 4th century AD, a priestess known as the Pythia gave answers believed to come from the god Apollo to cities, kings and private individuals. Her pronouncements shaped decisions about war, colonisation, law and religion, and Delphi became a meeting point for the entire Greek world.

The sanctuary and its origins

Delphi lies about 570 metres above sea level on a steep mountainside beneath the cliffs known as the Phaedriades, looking down a deep valley towards the Gulf of Corinth. Greeks believed it was the centre of the world. In myth Zeus released two eagles from opposite ends of the earth, and they met at Delphi, which was marked by a sacred stone called the omphalos, or navel.

According to legend, the site first belonged to the earth goddess Gaia and was guarded by a serpent or dragon, the Python. Apollo killed the Python and took over the oracle, and his priestess was named the Pythia after it. Archaeology shows that there was a small settlement at Delphi in the Mycenaean period, but the cult of Apollo and the oracle developed from about the 8th century BC.

The sanctuary grew rapidly as Greek cities sent colonists across the Mediterranean. Founders of new colonies often consulted Delphi first, and the oracle gained a reputation for authority on such undertakings. The sanctuary was administered by the Delphic Amphictyony, a league of neighbouring Greek peoples, which also organised the Pythian Games, held every four years from 582 BC as one of the great panhellenic festivals alongside the Olympic Games.

How the oracle worked

Originally the oracle was consulted only once a year, on the seventh day of the month Bysios, considered Apollo’s birthday. Later it was available on the seventh day of each month for nine months of the year. During the three winter months Apollo was believed to be absent, and the god Dionysus presided at Delphi.

Enquirers purified themselves in the waters of the Castalian spring and paid a fee, called the pelanos. A goat was sprinkled with cold water; if it trembled, the god was considered willing to answer and the animal was sacrificed. Cities and important visitors could pay for the right to consult first, a privilege called promanteia.

The Pythia herself bathed in the spring, entered the adyton, the innermost part of the Temple of Apollo, and sat on a bronze tripod. Ancient writers say she held a sprig of laurel, Apollo’s sacred plant. The question was put to her, and she gave the god’s answer. Priests and officials, the prophetai, were present and may have helped put her words into hexameter verse, although ancient sources are not clear about their exact role.

In classical times the Pythia was a woman from Delphi, often of mature age, who held the office for life and lived apart from her family. When demand was at its height, Plutarch says two Pythias took turns, with a third in reserve. Plutarch, a philosopher and biographer who served as a priest at Delphi around AD 100, is one of our best sources on how the oracle worked in his day.

Vapours, trance and science

Several ancient writers mention a breath or vapour that rose in the temple and inspired the Pythia. Plutarch suggested that the oracle had weakened in his time because the vapour had diminished. Later authors, often hostile Christian writers, described the Pythia in a wild frenzy.

In the early 20th century French excavators found no chasm under the temple, and many scholars dismissed the vapour story. In 2001 a team led by the geologist Jelle de Boer and the archaeologist John Hale argued that two geological faults intersect beneath the temple and could have released light hydrocarbon gases such as ethylene, which can cause a mild trance. Their theory attracted wide attention, but other scientists have questioned whether enough gas could have been present. The question remains open, and it is likely that ritual and belief mattered as much as any physical cause.

Famous oracles

Many responses are known from ancient writers, although the classicist Joseph Fontenrose showed that a large number of the most famous ones are legendary or were invented or improved after the event. Most genuinely historical responses are straightforward answers on religious matters, such as which god to honour or how to found a cult.

The best-known story concerns Croesus, king of Lydia. Herodotus says he tested several oracles and found Delphi the most accurate, then sent lavish gifts and asked whether he should attack Persia. The oracle said that if he did, he would destroy a great empire. He did attack, and the empire he destroyed was his own, as told in Fall of Sardis (547 BC).

In 480 BC, as the Persian king Xerxes prepared to invade, the Athenians consulted Delphi. Herodotus records a first, terrifying answer telling them to flee to the ends of the earth, and a second that said a “wooden wall” would protect them and mentioned “divine Salamis”. Themistocles argued that the wooden wall meant the fleet, and the Greek naval victory at Salamis seemed to confirm his reading.

Delphi is also linked with the founding of colonies. Herodotus tells how the people of Thera were repeatedly urged by the oracle to found a settlement in Libya, which eventually became Cyrene in about 631 BC. Similar foundation stories exist for Syracuse, Croton and many other cities, though some were probably shaped after the colonies were already flourishing.

The popular image of the oracle as deliberately riddling comes largely from these celebrated stories. Ambiguous answers allowed the oracle to be right whatever happened, and later writers enjoyed tales of rulers who misread them. The more routine answers recorded in inscriptions, however, are usually clear and practical.

In Plato’s Apology, Socrates says that his friend Chaerephon asked the oracle whether anyone was wiser than Socrates, and the Pythia replied that no one was. Socrates said he spent his life trying to understand what this meant.

Wealth, wars and the temple

Greek cities competed to display their wealth and victories at Delphi. Along the Sacred Way that wound up to the temple they built small treasuries to hold offerings, such as the richly carved Siphnian Treasury of about 525 BC and the Athenian Treasury, built in the early 5th century BC. Statues and monuments commemorated battles, including the Serpent Column dedicated after the defeat of Persia at Plataea in 479 BC.

The temple was rebuilt several times. After a fire in 548 BC a new temple was completed in the late 6th century BC with support from the Athenian Alcmaeonid family. That building was damaged by an earthquake in 373 BC and replaced by a new temple in the 4th century BC, whose foundations and some re-erected columns are visible today. The maxims “Know thyself” and “Nothing in excess” were inscribed at the temple.

Control of Delphi’s wealth caused several Sacred Wars. In the Third Sacred War (356-346 BC) the Phocians seized the sanctuary and used its treasures to pay mercenaries, and the conflict helped Philip II of Macedon extend his influence into central Greece. In 279 BC a Celtic army attacked Delphi but was driven off, an episode described in Celtic Invasion of Greece (279 BC).

Decline and rediscovery

Under Roman rule the sanctuary lost much of its political importance. The Roman general Sulla took treasures from Delphi in 86 BC, and the emperor Nero is said to have removed hundreds of statues. Emperors such as Hadrian supported the site, but by the 4th century AD Christianity was spreading and pagan cults were under pressure. A last oracle supposedly given to the emperor Julian, declaring that Apollo no longer had a home or a speaking spring, is preserved only in later sources and is probably not authentic. The oracle ended in the 390s AD, after Emperor Theodosius I banned pagan sacrifice.

A village called Kastri later grew up over the ruins. In 1892 the French School at Athens began the “Great Excavation”, moving the village to a new site and uncovering the sanctuary. Among the finds was the bronze Charioteer of Delphi, discovered in 1896, one of the finest surviving Greek bronzes. Delphi was inscribed as a UNESCO World Heritage Site in 1987.

Timeline

• c. 8th century BC: The cult and oracle of Apollo develop at Delphi.
• 582 BC: The Pythian Games are reorganised as a panhellenic festival.
• 548 BC: The Temple of Apollo burns and is later rebuilt.
• c. 547 BC: Croesus attacks Persia after consulting the oracle.
• 480 BC: Athens receives the “wooden wall” oracle before Salamis.
• 373 BC: An earthquake damages the temple.
• 356-346 BC: The Third Sacred War.
• 279 BC: A Celtic army attacks Delphi.
• 390s AD: The oracle ceases after Theodosius I bans pagan worship.
• 1892: The French School at Athens begins major excavations.

Why it matters

The Oracle of Delphi gave Greeks a shared religious authority at a time when they were divided into hundreds of independent states. Its sayings, especially “Know thyself”, still shape Western thought, and its stories of ambiguous prophecies remain some of the best-known tales from antiquity.