Fancasting meme : Canon or headcanon backstory/flashback scenes [1/6]: The Gray Lady and the Bloody Baron.
"I stole the diadem from my mother. I sought to make myself cleverer, more important than my mother. I ran away with it. My mother, they say, never admitted that the diadem was gone, but pretended that she had it still. She concealed her loss, my dreadful betrayal, even from the other founders from Hogwarts. Then my mother fell ill - fatally ill. In spire of my perfidy, she was desperate to see me one more time. She sent a man who had long loved me, though I spurned his advances, to find me. She knew that he would not rest until he had done so. He tracked me to the forest where I was hiding. When I refused to return with him, he became violent. The baron was always a hot-tempered man. Furious at my refusal, jealous of my freedom, he stabbed me. When he saw what he had done, he was overcome with remorse. He took the weapon that had claimed my life, and used it to kill himself. All these centuries later, he wears his chains as an act of penitence… as he should.