In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Q: Context: In 1454 the Prussian Confederation rebelled against the Teutonic Knights and formally asked the Polish King Casimir IV Jagiellon to incorporate Prussia into the Kingdom of Poland as a fief. Link Information: none Question: Who was the ruler of the State of the Teutonic Order when the Prussian Confederation rebelled?
A:
Answer: none