A human named Simon stole the Stone of Osiris and the Book of Rebirth from Lucien, to his embarrassment.
Lucien left Aurora and Tristan's company to get the Stone and the Book from Simon.
Simon encounters the Gemini Coven and their leader, Osmond, who was an ancestor of the Parker family, in England around this time. Osmond kills Simon and takes the Stone and the Book from him.
Lucien Castle and a group of vampire minions he sired then arrived in England, having tracked Simon down to England, knowing Simon had stolen the Stone from him. Lucien winded up meeting with Osmond, asking for the Stone back. Osmond refused, explaining that the Stone had mystical properties and he didn't know why a vampire wanted it.
Lucien and his minions decided to try and massacre the Coven the next day. The Gemini Coven retaliated by killing Lucien's minions, and afterwards, desiccating Lucien and entombing him alive.
Elijah Mikaelson came up with the idea of the Strix. He wanted to assemble minds curious about the world and eager to improve it, along with the time and circumstance to do so. His desire was to create an elite brotherhood devoted to a new, better civilization.
Elijah sired the four original members of the Strix, all of whom were male and in positions of power in human society.
The Strix encountered Tristan de Martel and his sister, Aurora. The Strix was only made up of 12 vampires at this point, including Aya. Effortlessly, Tristan managed to eliminate every member of the Strix, but spared Aya, because he was impressed with her fighting prowess. Tristan, now intrigued with the idea of the Strix, decided to revive it with Aya as his second in command and Tristan as the leader. Together, he and Aya searched the world for members of Elijah's bloodline and recruited them to join the Strix.
Aurora saved Lucien, who had been buried and dessicated alive, in the ground, somewhere in England. Lucien had been desiccated for 138 years. Tristan hated having Lucien back and the two often butted heads, while Lucien and Aurora resumed their romantic relationship.
Not being able to tolerate Lucien's presence any longer, Tristan asked Aurora to choose between him and Lucien. Reluctantly, Aurora chose Lucien, breaking Tristan's heart. She left with Lucien, and when asked by Aya whether they should chase after her or not, Tristan assured her that she would come back to him someday, that he gave her and Lucien "a century or two at the most".
After spending 82 years with the Strix, learning everything he could from them, Julian decided he wanted to leave, having grown tired of them and wanting to be on his own again. Tristan responded to this by telling him that no one ever leaves the Strix. He also warned Julian that should he attempt to, that he wouldn't be too hard to find considering his "ripper" problem.
Lucien and Aurora have a falling out. Aurora seeks out Tristan and reunites with him and the Strix in Virginia. To Aurora's mild annoyance, Tristan tells her that her and any vampire who is not apart of Elijah's bloodline is still unable to become a member of the Strix.
Tristan and the Strix tracked down Julian in England, who was travelling with Lily and her band of Heretics at the time. On the 24th of January, Tristan and Aya met up with Julian while he was alone with Lily, making sure the Heretics were not near by to prevent them from interfering. Aya snapped Lily's neck while Tristan plunged a wooden stake into Julian's heart, killing him. Devastated, Lily had the Heretics preserve Julian's body with magic in hopes that they would one day be able to resurrect him.