Question: Who was the leader of the Tokugawa shogunate?
Paraphrase: Who led the Tokugawa shogunate?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P39 wd:Q205662 . ?sbj wdt:P31 wd:Q5 } 
Answer: Tokugawa Hidetada, Tokugawa Ieyoshi