Hugh (circa 855 – 895) was an illegitimate son of Lothair II by his relationship with Waldrada. He did not inherit his father's kingdom, but he did receive many lands and benefices in the Duchy of Alsace from his uncle, Louis the German.
After his Easter court (23 April) in 882, Louis the Younger enfeoffed Hugh with Alsace, but the latter rebelled and Louis chased him in Burgundy. In 883, Hugh's sister Gisela married Godfrey, the Viking leader ruling in Frisia. With this alliance, Hugh plotted to seize his father's old kingdom, but in 885, Charles the Fat heard of the scheme and called both Hugh and Godfrey to court, where the former was blinded and the latter killed. Hugh was sent first to Sankt Gallen, then to Fulda, and finally to Prüm in his own country.