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One of Poppo's sons, Henry, served as "princeps militiae" under King Louis the Younger and was sometimes called margrave ("marchio") and duke ("dux") in Franconia under King Charles the Fat of East Francia. He was killed fighting against the Vikings during the Siege of Paris in 886. Another son, Poppo II, was margrave in Thuringia from 880 to 892, when he was deposed by King Charles' successor Arnulf of Carinthia. The Popponids had been favoured by Charles the Fat, but Arnulf reversed this policy in favour of rivalling Conrad the Elder, a member of the Conradine dynasty from the Lahngau in Rhenish Franconia and relative of Arnulf's consort Ota.