Context: At the end of the 15th century the Ottoman Empire advanced all over Southeastern Europe, eventually conquering the Byzantine Empire and extending control over the Balkan states. Hungary was the last bastion of the Latin Christian world in the East, and fought to keep its rule over a period of two centuries. After the tragic death of the young king Vladislaus I of Hungary during the Battle of Varna in 1444 against the Ottomans, the Kingdom was placed in the hands of count John Hunyadi, who became Hungary's regent-governor (1446–1453). Hunyadi was considered one of the most relevant military figures of the 15th century: Pope Pius II awarded him the title of Athleta Christi or Champion of Christ for being the only hope of resisting the Ottomans from advancing to Central and Western Europe.

Question: Which empire completed its conquest of the Byzantines at the end of the 15th century?
Answer: Ottoman

Question: In what year did the Battle of Varna take place?
Answer: 1444

Question: Which Hungarian ruler was killed at the Battle of Varna?
Answer: Vladislaus I

Question: Who was appointed regent-governor of the Kingdom of Hungary in 1446?
Answer: count John Hunyadi

Question: Who gave the title of Champion of Christ to John Hyundai?
Answer: Pope Pius II

Question: Which empire completed its conquest of the Byzantines at the end of the 14th century?
Answer: Unanswerable

Question: In what year didn't the Battle of Varna take place?
Answer: Unanswerable

Question: Which Hungarian ruler was saved at the Battle of Varna?
Answer: Unanswerable

Question: Who was appointed regent-governor of the Kingdom of Hungary in 1464?
Answer: Unanswerable

Question: Who gave the title of Champion of Christ to Sean Hyundai?
Answer: Unanswerable