What is {instance of} of {East Francia} that is {start time} is {843-1-1} ?
Which was the event that begun happening in East Francia in 843?
What started to happen in East Francia in 843-1-1?
SELECT ?u WHERE { resource:East_Francia rdf:type ?r . ?r property:start_time ?u . FILTER ( CONTAINS ( ?u , '843-1-1' ) ) . ?r rdf:type ?u }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q153080> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P31> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <843-1-1>
} 

SELECT ?obj WHERE { wd:Q153080 p:P31 ?s . ?s ps:P31 ?obj . ?s pq:P580 ?x filter(contains(?x , '843-1-1')) }