What is {position held} of {Umberto I of Italy} that is {replaces} is {Victor Emmanuel II of Savoy} ?
When did Umberto succeed Victor?
When did Umberto I of Italy replace Victor Emmanuel II of Savoy?
SELECT ?m WHERE { ?v property:replaces resource:Victor_Emmanuel_II_of_Savoy . ?v property:position_held ?m . resource:Umberto_I_of_Italy property:position_held ?v }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q153688> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P39> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P1365> <http://wikidata.dbpedia.org/resource/Q168691>
} 

SELECT ?obj WHERE { wd:Q153688 p:P39 ?s . ?s ps:P39 ?obj . ?s pq:P1365 wd:Q168691 }