How many {inspired by} are to/by {Roman mythology} ?
How many are inspired by Roman mythology?
SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P941 wd:Q122173 }
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/P941> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q122173 .
} 

Which is the number of people inspired by Roman mythology?