How many {culture} are to/by {ancient Rome} ?
How many had the culture of Ancient Rome?
Ancient Rome was the culture of how many?
SELECT ( COUNT ( ?x ) AS ?s ) { ?x property:culture resource:Ancient_Rome }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2596> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q1747689 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P2596 wd:Q1747689 }
1031