Hi. According to O'Gorman's book 'Descendents of the Virginia Calverts', I am descended from your family. I have doubts that she is right, but she lists my gg-grandfather, Nathan Calvert as being one of your Robert Calvert's descendents. Some of the Kentucky Calverts moved to Clark County MO, as did Nathan. However Nathan was in Ohio (Athens County) with many other Calverts that O'Gorman lists as Robert's children. My grandfather was always told that the other Calverts in Clark County were his cousins, and he named my dad after one of them. Those MO Calverts were direct descendents of Leonard Calvert, governor of MD. I think it is possible that there were two Nathans, am still working to find out. But this book will definitely help you. She doesn't have all family members names, but between familysearch.com and her book, you should be able to get a wealth of info. Chapter VI, 'John of Frederick'. Apparently, John left PA and got land in Frederick County VA, then some of the family moved to OH, Let me know if any of this interests you....I have the pages copied from her book. Peggy P.S. If you know anything about Nathan, I'd love to hear it!!!