I have heard of D,arcys of Hyde Park but not your story. George D,arcy was the last (I think) of the name to live in Hyde Park.My mother always said she was related to D,arcys. She was born in Raharney Westmeath and her grandmother was Anne D,arcy. Annes father and grandfather were both Matthew D,arcy. The story was one married a Catholic named Anne Daly and was disinherited from family. I have never been able to verify this story.Hope this may be of some interest toyou.