In The Serpentine Key, the secret to Greek Fire is stolen through the subterfuge of a member of the imperial family itself and used as a bargaining chip in the intrigues surrounding the rebellion against Basil II in the 980s.
Greek Fire was an incendiary weapon, most famously used by the Byzantine Empire from at least the seventh century C.E., eventually being lost to obscurity, some say by the end of the thirteenth century. Greek Fire is most famous for being able to burn on water and reputedly not being able to be extinguished with water. Some even said that water fueled its flames. The only things that could extinguish it were supposedly vinegar and stale urine, both of which were used to infuse cow hides which were then placed over fortress walls and ships to protect them from igniting. This was useful knowledge for those against whom Greek fire was used, including the Rus, Bulgarians, Turks and others. In 814, the Bulgarians captured several barrels of the stuff and 36 siphons, but because of the complex nature of operating the devices, they went unused. In 941, the liquid was used against the Rus with deadly efficacy. Liudprand of Cremona remembered this event when he wrote: “The Rus, seeing the flames, jumped overboard, preferring water to fire. Some sank, weighed down by the weight of their breastplates and helmets; others caught fire.” Those who escaped were captured and executed. The Rus never again attempted to besiege Constantinople, preferring in later years to guard the city in the capacity of the Varangian Guard.
It is telling that this weapon was not called Greek Fire in its own time. Indeed, the Byzantines who thought of themselves as nothing by Roman, would have been insulted by the appellation of Greek, even though it was the language most in the Empire spoke. Instead it was called Roman fire, Kallinikos fire, sea fire, liquid fire and even wild fire, and it is this latter name that George R.R. Martin in his Song of Ice and Fire series chose for the green fire used by the characters in his fantasy.
Greek fire is credited to a Syrian known as Kallinikos or Callinicus. Supposedly, his descendants, a family by the name of Lampros, were responsible for guarding the secret. This story in itself is controversial. The name Lampros means “Brilliant” Was this a cover for the people who were in charge of keeping it secret? It has been said the the secret was never written down, but was given into the care of three alchemists who each knew a portion of the formula, but not all of it, so that it could not be stolen. Were these alchemists of the Lampros family? Or were they members of a family at all, but actually more of a secret organization charged with the security of the Byzantine Empire?
Incendiary weapons were hardly new to the scene when Kallinikos came along. They are depicted as being used by the Assyrians and are mentioned numerous times in historical records. So what made Greek Fire so special? There were a lot of people who wanted to get their hands on it and the Byzantines would do a lot to keep it out of the hands of their enemies. It was said that on his deathbed, Romanos II, charged his son (Basil II’s father) to never deliver the secret to the enemies of the empire, declaring the weapon to be a gift from the angels and “not to prepare this fire but for Christians, and only in the imperial city”. In addition to the alchemists who compounded the secret formula, there was also the task of constructing the siphons through which the liquid was propelled at other ships. Furthermore, the men who operated the siphons needed to be trained to effectively operate them. The siphons would likely have been a device in which the liquid was heated in a sort of covered cauldron, whereupon it would have been forced through a siphon that was pumped, giving it the necessary pressure to effectively spray the heated liquid over a good distance with deadly effect. Those operating this system would likely have needed some sort of protective covering, perhaps leather garments soaked in vinegar or stale urine.
Of the two plants known as hellebore to the ancients, only one was true hellebore. They were not related, but both were very poisonous. Black hellebore Helleborus niger is the true hellebore and sometimes used as a purgative. White hellebore or false hellebore (Veratrum album ) is the subject of this article. It is most famous for its role in its use in poisoning the water supply of the residents of Kirrah by their Greek besiegers. The besieged were so weak from the emetic effects of the plant, they were unable to withstand the assaults of the enemy upon their city.

immunity to belladonna as related in George Buchanna’s History of Scotland, vol 6:
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Poison! Just the word would cause a medieval citizen of Constantinople to cast a furtive glance into his or her cup. Almost all the poisons available to the people of the Middle Ages were derived from plants. Not all who were suspected of dying of poison, necessarily did so, but it is a testament to how common it was and much the danger was ever present on the mind of especially upper class Byzantines.
Of the ones we will talk about in this series, most notorious is Aconitum, among many other names also known as Monk’s Hood, Wolfsbane (for its reputation in poisoning wolves) and Queen of Poisons. It belongs to the family Ranunculaceae, including over 250 species. The Byzantines would have been very familiar with this deadly poison, dubbing it lykotonon — “wolf slaying”. Historically, Cleopatra VII of Egypt was said to have poisoned her brother Ptolemy XIV with aconite. In classical mythology, the sorceress Medea attempted to have king Aegeus unwittingly kill his own son, Theseus with a cup poisoned with aconite. It is said to have sprung from the spittle of Cerberus, famed three-headed dog of Greek myth. Even touching this deadly plant, especially the roots, can gain you an unpleasant death.
A case has been made for the fly agaric mushroom. Despite the fact that this red fungus, speckled with white shows up in almost every European fairy tale picture book you ever read as a child, it grew in Europe in only isolated areas. It certainly does not grow in Iceland where there is much mention of the berserkers. Furthermore, the effects of the mushroom, unless used very carefully, are more likely to produce real illness than the desired level of hallucination in those who ingest it. The potency of the mushroom is affected by many things: the time of the year it is harvested, where it has been harvested and how it is collected. There is not enough uniformity to produce the desired outcome.
Icelandic Egil’s Saga whose father Skallagrim was a berserker and the son of Kveldulf Bjalfson or Evening Wolf, also a berserker. This very much indicates the condition was genetic and places some weight on its being something like IED which we have today.
“There was a man named Ulf, son of Bjalf… Ulf was a man so tall and strong that none could match him and in his youth he roved the seas as a freebooter….he was a berserker.” Egil’s Saga.
Dessert is an apt conclusion to the series on food. Desserts, including sweetmeats and honey cakes were eaten by the higher classes, including koptoplakous, the ancestor to baklava still eaten in Greece today. It would have certainly been on Theophana’s table: