Question: What started to happen in East Francia in 843-1-1?
Paraphrase: Which was the event that begun happening in East Francia in 843?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q153080 p:P31 ?s . ?s ps:P31 ?obj . ?s pq:P580 ?x filter(contains(?x , '843-1-1')) }