What is {instance of} of {East Francia} that is {start time} is {843-1-1} ?
What started to happen in East Francia in 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')) }
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>
} 

Which was the event that begun happening in East Francia in 843?