Question: When was the maternal uncle of Popiel I died who was the notable author of Latin prose?
Sentence (from "Louis I of Hungary"): Louis I, also Louis the Great (Hungarian: "Nagy Lajos" ; Croatian: "Ludovik Veliki" ; Slovak: "Ľudovít Veľký" ) or Louis the Hungarian (Polish: "Ludwik Węgierski" ; 5 March 132610 September 1382), was King of Hungary and Croatia from 1342 and King of Poland from 1370.
Relevant evidence: No