What are the aspect of histor which start with the letter r
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q17524420 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'r')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
aspect of history: Q17524420