Name a military order that served the Holy Roman Emperor that contains the word "knights" in its name
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q474717 . ?sbj wdt:P945 wd:Q181765 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'knights')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
military order: Q474717 holy roman emperor: Q181765