Any one else think Celestia is taking this a bit far? I mean the treaty is over a thousand years old, so why should the prince agree to honor it? I know if I was the ruler of some nation and some princess told me that she now ruled due to a treaty that my great X 10000 grandfather signed, I would tell her to get lost.
But this is way out of left field. Why does she care so much about a treaty that is over a thousand years old? Judging by what she says, it sounds like she is planning to go to war over it, which is just to far out of character for her.
But then Hazura Sinner maybe planning on explaining why this treaty is so important. I just hope it isn't something silly like Celestia is just honoring her mother's memory, because going to war and condemning thousands to death and suffering just to honor some dead person is pretty selfish.