From Ex illis wiki
(742-814, resurrection 1265-1281)
Imperator inter homines (honorific: 1266-70; fully: 1270-81)
Charlemagne resurrects during the Mongol invasion in Germany. He quickly claims his right over his former Frankish Empire, but he is only granted the honorific title of Imperator inter homines by Friedrich II and Barbarossa who also point to him that the Frankish Empire became the Kingdom of France. Aware that he could not defeat both emperors at once, Charlemagne is satisfied with the title, and he travels to France to demand Louis IX's allegiance. The King of France politely receives him but refuses to become his vassal. Charlemagne goes back to Germany without any tangible territory. Then, Albenkönig Alberich agrees to harbour him, causing people to mischievously call him Imperator nanus (Emperor of the dwarves).
Alberich and Charlemagne plan the Rückeroberung together. The Albenkönig provides the Frankish leader with troops of Alben warriors and convinces Goldmar I to do the same, while Charlemagne uses his charisma and renown to unify European kings in a massive campaign against the Mongol invaders. He leads the Christian army with Archangel Michael, slowly recapturing villages and towns fallen to the enemy.
The ultimate battle takes place in 1270 near Wien. The angels prove their superiority and Michael is the hero of the day, but Charlemagne remains the true winner of this war. He goes to Roma surrounded by an aura of glory, showing to Europe that the great emperor he had been is back. The Pope grants him new powers and makes him the leader of Christendom, the emperor of kings. With the mighty Catholic Church behind him, nobody can contest his rule, and every noble and monarch kneels before him.
In 1271, the newly elected Pope Gregorius X asks the pious Charlemagne to launch a massive demon hunt: the Captura Grandis. The Imperator builds a strong army with the mission to accompany the inquisitors and angels led by Uriel throughout Europe. Fleaudians are pursued and burned at the stake. Chaos spreads everywhere; people denounce their neighbours and relatives in order to save their own lives, and free violence and murders frequently occurr, always in the name of God. Under Charlemagne's reign, the Inquisition reaches its Golden Age.
But the Imperator knowingly forgets to hunt some fleaudians he respects. When Bonifacius VIII ascends the papal throne in 1280, he pushes Charlemagne to prove his religious fervour by killing the dwarves, his old loyal friends. To avoid a fight with the papacy, who is behind his title and powers, he captures many Alben and Zwergen, including Goldmar I, and orders their execution in Strossburi. He turns a deaf ear to their pleas.
The following year, the Albenkönig, who survived the hunt, swears to avenge his friends. One day, when he returns to the city of Strossburi, Charlemagne is attacked by dwarves and several citizens. His personal guard is slaughtered, and the emperor is literally cut to pieces. This event marks the end of the great Imperator inter homines and the beginning of a new era for Christendom.