what is the  date of birth of Chlohar II in the statement with Gregorian date earlier than 1584 ?
SELECT ?obj WHERE { wd:Q209118 p:P569 ?s . ?s ps:P569 ?obj . ?s pq:P31 wd:Q26961029 }
chlothar ii: Q209118 statement with gregorian date earlier than 1584: Q26961029