What is date of birth of Flavius Aetius that is instance of is statement with Gregorian date earlier than 1584 ?
SELECT ?obj WHERE { wd:Q185476 p:P569 ?s . ?s ps:P569 ?obj . ?s pq:P31 wd:Q26961029 }
flavius aetius: Q185476 statement with gregorian date earlier than 1584: Q26961029