Question: What is the date of death of the composer of song U Boj, U Boj?
Sentence (from "U boj, u boj"): It is a retelling of the Battle of Szigetvár of 1566, in which Nikola Zrinski, Ban of Croatia and captain of the assembled Croatian and Hungarian forces, took a heroic last stand against overwhelming Ottoman forces, led personally by Suleiman the Magnificent.
Relevant evidence: No