The Mad Queen
Memento Mori. Unus Anus

-13.8 billion years ago: The Cataclysm happens and our universe is born in "the big bang" this event however, destroys a neighbouring universe that is older than our own. Some of these beings take refuge in our newly born universe, shaping it as it grows.
-4.543 billion years ago: Earth is formed. Some of these Old Gods take up home on Earth, and wage a war on it's surface for dominance.
-66 million to 200,000 years ago: The remaining Old Gods on Earth fall into slumber when the planet is faced with numerous mass extinction events.
-The reign of Atlantis is said to have occurred during these years. Due to a mixture of destroyed records and the erosion of time there isn't a set time period for the rule itself, only that the civilisation may have fallen around 6000BCE and 5600 BCE
200,000 years ago: Oldest record of humans active on Earth. The 13th Angel, Lucifer falls from grace after challenging his creator over humanity and becomes the First Devil when stripped of his Angelic power and tossed into Hell.
-According to Vamperic scripture, a man named Cain is cursed and turned into the first Vampire.
6000 BCE-1939 AD
-The surviving Atlanteans forge kingdoms across the world, guiding humans towards the first civilisations. Two notable examples would be Mesopotamia and Ancient Egypt. In the case of Egypt, the Atlanteans were worshipped as Gods. Some of the early civilisations collapsed due to the lust for power of these beings, with many lost to history completely. While the Atlanteans faded into history, their image is captured in the hieroglyphics.
-As humans expand across the world, the first Changeling is believed to have emerged as a result of a bored High Fey. This marks the first contact between our realm and the Feywilds.
Due to numerous records destroyed by the various Churches and other organisations the history during this time is rather hazy. However, since 2020 scholars have been trying to piece things together.
-Prior to the Roman's invasion of Britannia the Celts and many supernatural creatures lived together. The construction of Hadrian's wall can be attributed to keeping the Roman Empire safe from some of these creatures. The bones of giants, Fey and other creatures can be found in Scotland. Some of these we have been unable to identify, leading us to believe that the Romans pushed a few supernatural races native to Britannia to extinction.
The Celts were not the only civilisation to embrace supernatural beings, or at least live among them. In Ancient Greece some even lived openly in Athens, and there are documented cases of humans being fed on by Vampires willingly.
In pre-colonial America some Native American tribes lived with these creatures as well.
Supernatural creatures fighting on the side of Russia goes back to the Napoleonic wars, and possibly even further with uncovered records of the Mongolian invasion of Kievan Rus' (modern day Russia, Belarus and Ukraine) having both sides using supernatural and unearthly means to fight, while in Japan this goes back to somewhere between the late 8th or 9th century.
The 人生の兄弟愛 (Jinsei no kyōdai ai) or Brotherhood of life was created during this time. Japan was a country facing numerous supernatural threats and the founder, a Vampire who detested what he deemed as a curse sought about training a Brotherhood that would outlast even himself to fight this threat.
It was a secret organisation known only to the Emperor himself and a few within his court, but was placed on the front lines during the Mongolian invasions. Storms generated by these creatures were able to decimate the Mongolian fleet and the Brotherhood fought fire with fire, for the Mongolians used supernatural creatures as part of their army so too did the Japanese.
-First documented cases of Skinchangers in Britannia come from Viking raiders. Some invading Viking Clans possess a unique gift, these shape-changers are believed to have been Werewolves. Despite their power, they were pushed back by Alfred the Great who we can only theorise either knew of their weaknesses or was some kind of supernatural creature himself. Prior to the Viking raids there is no record of any living in what is now the United Kingdom.
-Although the Churches hunted supernatural beings, dispatching holy warriors some managed to gain favour with various royal families. The most notable example of this is Queen Elizabeth I of England, who made an agreement with a collective of these beings that lasted from her reign up until Oliver Cromwell took power. They would destroy the Spanish for her, and in return gain refuge in England from the church.
Elizabeth chose to keep this a secret for a fear of the response from the church among other powerful forces active in the country and from outside sources. After Cromwell drove this group out of English territory, killing a large portion of them in surprise attacks it wasn't until the reign of Queen Victoria that British Royalty reached out to such a group again, in the form of Prince Albert. This would later lead to the creation of a secret society in Albert's name upon his death to document activity in the British Empire.
-JRR Tolken and Alan Turing among others were notable members of this secret organisation, with Marie Curie being the first woman to lead her own team.
-In Russia, a notable Vampire Sorcerer named Rasputin gained favour with the royal family.
-These beings operated in secret during WWI, fighting on the different sides in the conflict. Such a large human conflict spilled into their world and lines were drawn. While men killed each other in the trenches, the likes of the undead and the damned fought their own secret war.