As his wife's mother was related to the Bavarian Counts of Ebersberg, who held possessions in Carniola, Poppo was also appointed Carniolan margrave.
Dat fiind că mama soției sale avea legături matrimoniale cu conții bavarezi de Ebersberg, care dețineau posesiuni în Carniola, Poppo a fost de asemenea numit și ca markgraf de Carniola.