Final answer:
The 'Scourge of God' refers to Attila the Hun, not Genghis Khan or Ivan the Terrible. Attila is noted for his fearsome invasions of Europe in the early 5th century.C. Attila the Hun
Step-by-step explanation:
The infamous ruler who was known as the 'Scourge of God' is C. Attila the Hun. Attila, as the leader of the Huns from 434 AD until his death in 453 AD, was known for his brutal and fearsome campaigns across Europe. Although historical texts sometimes present Genghis Khan with the title, it is Attila who is historically associated with this epithet. Genghis Khan, on the other hand, founded the vast Mongol Empire in the early 13th century and is recognized for his role in shaping world history.