Thulian Mystery Occults

Thulian Mystery Occults were various organizations that sprung up in Medieval times to study Thulian Manuscripts.
In modern times they have been superceded by groups such as the Golden Dawn, the Thule Society, SS Paranormal Division, and others.
==Background==
Following Charlemagne's conquest of Saxony in 804, and the subsequent conversion of the pagan Saxons, the so-called "Dark Teachings" were largely suppressed. As a result, little of consequence, relating to the Thulian Mystery Occults, occurred over the next century, Then, in 918 the Saxon Prince, Heinrich I, displayed a renewed interest in these teachings as he set out to form an independent Germanic kingdom, separate from the powerful Frankish dynasty. According to legend, Heinrich acquired knowledge of the most ancient and arcane Thulian texts. Texts purported to hold the dark forces that bind the Earth and all that which is contained within. 
Armed with this great power, Heinrich set about raising an army such as the world had never seen, an army of the undead. At the core of Heinrich's army were his three most trusted vassals, the legendary Dark Knights. In exchange for their loyalty, Heinrich imbued his Dark Knights with enormous power by means of an obscure Thulian ritual. Through this ritual, Heinrich and his companions became, themselves, living conduits of the dark forces, masters of the nether regions between life and death. 
In 933, Heinrich unleashed his irresistible army against the invading Maygars, inflicting a crushing defeat upon them at Riade. Next, he turned his eyes west, intent upon overthrowing his Frankish overlords. It is difficult to imagine what the extent of his conquests might have been had it not been for one fateful encounter. 
His unlikely opponent was Simon the Wanderer. A former Benedictine monk, Simon left the order to form his own mysterious sect. With his chosen followers he traveled incessantly throughout Europe, Asia Minor, and the Far East, collecting countless mystical items of knowledge from all the ancient cultures of the Old World. No doubt the channeling of raw fundamental, destructive forces as practiced by Heinrich would have seemed an anathema to someone of Simon's reflective and meditative nature. 
The confrontation occurred - so the legend says - in 943. After a prolonged, cataclysmic struggle, Simon and his followers, by means never revealed, managed to neutralize and slay the Dark Knights. Their remains were entombed in undisclosed locations, painstakingly sealed against future violation. 
As for the fate of Heinrich, the sources are even more vague. Some say he was also slain. Others state that he could not be destroyed. That he was trapped in a state of spiritual stasis. Sealed in the very earth that was the source of his power.