query: embed.html#SELECT DISTINCT ?item WHERE {
    ?property wikibase:propertyType wikibase:Time .
    ?property wikibase:claim ?propertyclaim . 
    ?property wikibase:statementValue ?propertyvalue . 
    ?item ?propertyclaim ?dateclaim .
    ?dateclaim pq:P31 wd:Q26961029 .
    ?dateclaim ?propertyvalue ?claimvalue .
    ?claimvalue wikibase:timeValue ?datetime .
    ?claimvalue wikibase:timePrecision ?dateprecision .
    FILTER(?dateprecision <=9 && year(?datetime) < 1580 )
  } LIMIT 50000