Otto the Illustrious

Otto (c. 830/851 – 30 November 912), called the Illustrious (German: Otto der Erlauchte) by later authors, was a notable member of the Ottonian dynasty and Duke of Saxony from 880 until his death in 912. He played an important role in early medieval history of Germany during the 9th and 10th centuries, noted for his military campaigns and diplomatic efforts.

Source: Wikipedia — https://en.wikipedia.org/wiki/Otto_the_Illustrious