In the late 1700's Frederick County in Virginia and Maryland became what is known today as Berkeley County and Jefferson County in West Virginia. This can be researched in Berkeley County West Virginia. I have suspicions that Frederick County in PA was apart of this action, but need to research it more. My great grandmother was Matilda Jane Esworthy, married to James Asberry Pyle. Her father was Thomas Esworthy married to Elizabeth Good. The father of Thomas was Robert married to Matilda Brookover. Anyone have any other information, I would appreciate it. Thank you.