The summer air over London felt heavier than usual in those final weeks of August 1666, with reports of odd glows lingering above the Thames and stories of restless nights filled with unsettling dreams. This article examines the documented omens recorded before and during the Great Fire of London, drawing directly from diaries, pamphlets, and official reports of the period. It looks at the astronomical events, ghostly sightings, and prophetic claims that survivors preserved, while weighing those accounts against the known conditions of a city still recovering from plague and against later historical analysis.

Historical Context: A City Ripe for Disaster

The fire began in the house of Thomas Farriner, the king’s baker, when a smouldering oven was left unattended. Strong easterly winds carried the flames to neighbouring roofs and quickly turned the blaze into a moving wall of heat. King Charles II joined efforts to fight it, and Samuel Pepys recorded the panic in his diary, even burying his cheese to protect it from looters. By the time the fire died out near Pie Corner on 6 September, roughly four-fifths of the walled city had been destroyed and about 70,000 people had lost their homes. Official counts listed fewer than ten deaths, though many more probably went unrecorded in the chaos. Christopher Wren later proposed wider streets and stone buildings, yet much of the old layout survived the rebuilding.

London had already endured the Great Plague the year before, which removed a fifth of its population. That recent loss left people quick to see any new disaster as divine punishment. Preachers warned that the city had grown too fond of vice and too tolerant of religious differences. When the fire arrived, those sermons gained fresh force, and printed sheets declared the flames a form of judgment. Understanding the mood of the time helps explain why ordinary weather and ordinary stars were read as warnings rather than coincidence. One way to picture the tension is to remember how a single spark in dry conditions can race through timber frames packed close together, much like how fear spreads when a population has already buried so many neighbours.

Celestial Warnings: Comets and Portentous Skies

People in 1666 watched the night sky with particular attention. The Great Comet of 1664-1665 had lingered for months, its tail visible across Europe. John Evelyn wrote of its fiery appearance and linked it to coming troubles. A second comet appeared briefly in the summer of 1666, and its timing with weeks of hot, dry weather added to the sense that the heavens were unsettled. Historians today can cross-reference these sightings with records from other European cities, showing that the same objects drew notice from observers in Paris and Rome, which suggests the reports were not simply local invention but part of a shared sky-watch that felt urgent after months of plague recovery.

The Diabolical Comet of 1666

The most striking report came in the final days of August. Witnesses described a red streak low over the Thames that seemed to pulse with its own light. Nathaniel Crouch, writing the following year in A Narrative of the Fire, recorded a star of unusual size shaped like a sword of flame that hung over the city from 20 to 28 August. William Lilly, whose 1651 almanac Monarchy or No Monarchy had already spoken of London’s ruin, pointed to the comet as proof that his earlier prediction had come true. These sightings were not dismissed as fantasy at the time; they fitted a long tradition of reading comets as messages about war, plague, or fire. What makes this period interesting is how the lack of a fixed comet catalogue forced people to rely on older symbolic systems, turning an astronomical event into something that felt personally directed at their streets and homes.

Seventeenth-century observers had no modern catalogue of comets to consult. They compared what they saw to biblical images such as the star that guided the wise men or the portents in the book of Revelation. Unseasonal heat and red sunsets, possibly caused by distant volcanic dust or city smoke, deepened the impression of an angry sky. When the fire began days later, many felt the connection was obvious. Modern tools like planetarium software now let us recreate the exact positions of those comets, confirming the dates and visibility windows while also showing how atmospheric haze could have intensified their colour, which adds a layer of natural explanation without erasing the emotional weight the sightings carried for witnesses.

Lunar and Atmospheric Anomalies

Full moons in July and August appeared tinged with red, an effect that recalled the verse in Joel about the moon turning to blood. Thick mists formed at night and sometimes seemed to glow from within, parting to show moving lights above the rooftops. Loud thunder rolled across the river on clear evenings, and some listeners took the sound for trumpets announcing disaster. These reports spread through every level of society, from market traders to the astrologers consulted at court. The red tint itself can now be linked to dust in the upper atmosphere from distant eruptions, yet the way people interpreted the colour as a direct biblical echo shows how cultural memory shaped what they believed they were seeing.

Earthly Omens: Ghosts, Visions, and Prophetic Dreams

Alongside the sky phenomena came stories of figures seen on the ground. Watchmen near St Paul’s described a tall man dressed in black and wrapped in smoke who vanished into the cathedral walls, an image that later seemed to foreshadow the building’s destruction. In Pudding Lane itself, people spoke of a horned figure stepping out of ovens at midnight. Printed sheets carried accounts of fiery shapes dancing in the alleys, their voices mixed with the sound of burning wood. These ground-level reports often surfaced in places already marked by tension, such as narrow lanes where the plague had recently emptied houses, turning everyday shadows into something more ominous.

Spectral Sightings in the City

Elias Ashmole, a noted collector of curiosities, wrote of a vision on 30 August in which he saw a great dragon coiled around the city, its breath setting fires from one end to the other. Around the same time, doors were said to slam without wind, and unexplained burn marks appeared on walls. These incidents increased as the fire drew nearer, leaving residents already on edge when the first flames appeared. Ashmole’s account stands out because he was known for careful record-keeping in other fields, which gives the report a certain weight even if later readers might wonder whether grief or fatigue coloured what he described.

Prophetic Folklore and Seers

Older prophecies were brought forward to fit the moment. Verses attributed to Mother Shipton spoke of London flames reaching the sky, though later scholars have shown those lines were added centuries after her death. George Fox and other Quakers recorded shared dreams of fire falling from heaven. Even at court, Queen Catherine was said to have received warnings from mediums about elemental forces stirred by forgotten relics. Such stories circulated widely because they gave shape to the fear that already filled the streets. The reuse of older prophecies illustrates a common human pattern where communities reach for familiar narratives during times of uncertainty, even when the details have been altered over generations.

Contemporary Investigations and Religious Interpretations

A parliamentary inquiry held in October questioned Thomas Farriner and concluded that the fire had started by accident during strong winds. Robert Hooke suggested using gunpowder to create firebreaks, an idea that helped limit later blazes. At the same time, church leaders such as Bishop Gilbert Burnet preached that the omens had been sent as warnings that the city had ignored. Brief rumours blamed foreign agents using secret machines, but these claims faded once the physical evidence was examined. Samuel Pepys noted the omens in his diary yet remained doubtful, calling much of the talk superstitious even while he admitted the comet had troubled him. Pepys offers a useful window because his private doubts sit alongside public reports, showing how one person could hold both curiosity and caution at once.

Paranormal Probes of the Era

No organised ghost investigations took place, but members of the Royal Society collected reports of strange lights and sounds. After the fire, priests performed rites at sites thought to be haunted, and some returned with accounts of lingering cold patches and a smell of sulphur that lasted into the following year. These efforts show how natural philosophers and clergy both tried to make sense of events that seemed to sit between the ordinary and the uncanny. The Royal Society’s interest marks an early step toward systematic collection of unusual observations, even if their methods lacked the controlled conditions used in later scientific work.

Cultural Impact and Enduring Mysteries

John Dryden’s poem Annus Mirabilis turned the omens into part of a larger story of endurance. Later artists such as Hogarth returned to the theme of ghostly traces left by the fire. Today visitors still pause at the plaque on Pudding Lane and sometimes report sudden drops in temperature or faint sounds on recordings. Modern researchers have suggested that small earth tremors may have dislodged embers in the bakery, offering one natural explanation for the start of the blaze. Others note that widespread anxiety after the plague could have shaped how people remembered the weeks beforehand. The rebuilt city, with Wren’s dome rising over St Paul’s, stands as a symbol of recovery, yet the old stories continue to surface in guided walks and local histories. Contemporary seismic monitoring of the London basin supports the idea that minor quakes were possible, which gives a plausible physical trigger without dismissing the emotional reality of the omens people described.

Conclusion

The omens recorded around the Great Fire of London show how a population under strain read meaning into comets, dreams, and shadows. Whether those signs were genuine previews, shared illusions, or simple coincidence remains open to debate. What is clear is that the accounts survived because they helped people place a catastrophe inside a larger narrative. Here at Dyerbolical we continue to examine these moments where history and reported experience meet, and you can read more about our approach at https://dyerbolical.com/about-us/. The questions raised in 1666 still invite careful attention whenever a city faces sudden loss.

Bibliography

John Evelyn, Diary, entries for 1664-1666. Samuel Pepys, The Diary of Samuel Pepys, 1666 volume. Nathaniel Crouch, A Narrative of the Fire, 1667. William Lilly, Monarchy or No Monarchy, 1651. Gilbert Burnet, History of His Own Time. The London Gazette reports, September 1666. Royal Society correspondence on atmospheric observations, 1666-1667. British Geological Survey archives on historical seismicity in the London basin.

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