How many {commissioned by} are to/by {William the Conqueror} ?
How many are commissioned by William the Conqueror?
SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P88 wd:Q37594 }
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/P88> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q37594 .
} 

What is the number commissioned by William the Conqueror?