I want to know the answer to the following question:
What was the nobles guarantee that his throne would be inherited by his sons?
All the background I'm provided with is that "King Władysław's quid pro quo for this boon was the nobles' guarantee that his throne would be inherited by one of his sons (who would be bound to honour the privileges theretofore granted to the nobility).". Is that enough to answer the question?
Answer: yes