When did the Louis II of Italy title as Emperor of Occident end?
SELECT ?value1 ?value2 WHERE { wd:Q215204 p:P97 ?s . ?s ps:P97 wd:Q23906200 . ?s pq:P582 ?value1 . ?s pq:P155 ?value2 }
louis ii of italy: Q215204 emperor of occident: Q23906200