What is {inception} of {Kingdom of Navarre} that is {instance of} is {statement with Gregorian date earlier than 1584} ?
How is a Gregorian date written prior to 1584
SELECT ?obj WHERE { wd:Q200262 p:P571 ?s . ?s ps:P571 ?obj . ?s pq:P31 wd:Q26961029 }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q200262> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P571> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q26961029>
} 

Prior to 1584, how are Gregorian dates written?