question: What was the nobles guarantee that his throne would be inherited by his sons ?
answer: King Władysław 's quid pro quo for this boon
turker_answer: King Władysław 's quid pro quo for this boon was the nobles guarantee that his throne would be inherited by his sons .
rule-based: The nobles was guarantee King Władysław 's quid pro quo for this boon that his throne would be inherited by his sons .