Question: who painting for depicted by of Alexander I of Russia?
Paraphrase: who portray for delineated by of Alexander I of Russia?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q15193 wdt:P1299 ?obj . ?obj wdt:P31 wd:Q3305213 } 
Answer: Alexander I, Emperor of Russia (1777-1825)