The expression "self-same sovereignty" means that women desire the same position of importance as men have within marriage. This answer was surprising as it went against the concepts of marriage established at the time.
We can arrive at this answer because:
The knight dared to say that women would like to have full control of their husbands if possible and that would make them happy.
This concept was completely contrary to what society thought and for that reason, we can say that the knight's response was so surprising.
This question is about The Wife of Bath's Tale.
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