Return of the Margravine

She was the daughter of the prestigious margravial house, yet she had severed her ties with her family to marry him, the Kingdom’s third prince.

She had fought in a bloody civil war just so she could secure the throne for him.

She had done every deed imaginable out of love for him.

But how did he thank her? As soon as she had given him all she was capable of, she was discarded.

First replaced by another queen, later thrown into prison.

Now he even sentenced her to death by burning at the stake as the witch she never had been, slaughtering her important people before her eyes.

That was one betrayal too much for her. Faced with the chance to return to the past in the moment of impending death, she decided to take it, no questions asked.

Now she is back twelve years prior.

Watch out, deceitful prince, for your former wife from another timeline will never allow you to rise to power again.

Now she will do everything in her might to keep her important persons save, hindering the career of her previous lifetime’s husband at every step.

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As English isn't my mother tongue, I would appreciate it if native speakers, anglicists or any other proficient users of the English language could kindly inform me about any mistakes in grammar or word choice so that I may correct it. The same applies to any sentence or paragraph that may sound unnatural in English.