what is the {instance of} for {Syagrius} has {date of death} as {487-1-1} ?
How did Syagrius die in 487?
SELECT ?value WHERE { wd:Q207499 p:P570 ?s . ?s ps:P570 ?x filter(contains(?x,'487-1-1')) . ?s pq:P31 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q207499> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P570> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <487-1-1> .
?statement <http://www.wikidata.org/entity/P31> ?value. 
} 

What was the cause of Syagrius death in 487?