Question: Which is the  start time for Salman of Saudi Arabia has position held as King of Saudi Arabia ?
Paraphrase: Salman of Saudi Arabia has position held as King of Saudi Arabia beginning at what time?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q367825 p:P39 ?s . ?s ps:P39 wd:Q850168 . ?s pq:P580 ?value}