Holy Roman Empire
Otto's victory over the Magyars caused him to receive the title of Holy Emperor because essentially, Otto saved Christianity. Because he drove away invaders with a different religion, the Pope crowned him with this title. After Otto, all German kings were crowned with this same title.
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Here is a photo of Fredrick II, also known as Stupor Mundi. He inherited the kingdom of Sicily from his mother at only three years old. "Wonder of the World" was the name of his empire, because he was an intelligent man who spoke many languages. Because of this, he could communicate with Muslim scholars as well as many other ethnic people, making this a diverse empire.