Question: Whose county seats are Mediolanum and History of Trier?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?uri <http://dbpedia.org/ontology/capital> <http://dbpedia.org/resource/Mediolanum> . ?uri <http://dbpedia.org/ontology/capital> <http://dbpedia.org/resource/History_of_Trier> . }