I have an old German language Family Bible printed in 1764 that belonged to my greatX3 grandfather. His name was Jacob DeVault and he married Mary Michael sometime around 1785-87 in Pennsylvania or Virginia. They moved to the Monongalia County region of what is now West Virginia around 1800. In the margin on one of the pages of the bible is written "Danel Micel" which I interpreted to be Daniel Michael. My best guess is Mary's brother or fathers name. There is a Daniel Michael in the Monongalia County region about that time, and I found that his family moved earlier from York, PA. However the only trees for him I found did not include Mary. So in the highly unlikely event that any of this rings a bell, feel free to contact me. Thanks!