what is the {start time} for {Anni-Frid Lyngstad} has {spouse} as {Prince Heinrich Ruzzo Reuss of Plauen} ?
When was the wedding of Anni-Frid Lyngstad and Prince Heinrich Ruzzo Reuss of Plauen?
When did Anni-Frid Lyngstad marry Prince Heinrich Ruzzo Reuss of Plauen?
SELECT ?i WHERE { ?z property:start_time ?i . resource:Anni-Frid_Lyngstad property:spouse ?z . ?z property:spouse resource:Prince_Heinrich_Ruzzo_Reuss_of_Plauen }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q201908> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P26> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q1208883> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q201908 p:P26 ?s . ?s ps:P26 wd:Q1208883 . ?s pq:P580 ?value}