I do not have any information that links a Caldwell with a Margaret Stapleton. My Caldwells were from Botetourt and Craig Counties, Virginia. One Asa Caldwell did live in Wise County for a while when he worked on the railroad there. I have his wife's name as Wilmoth, last name unknown. His parents Thomas and Amanda Caldwell lived in Ohio for a period of time (Gallia and Meigs County). Another son Elisha Winfred Caldwell was born in Ohio. I do not have a name for his wife. Family legend indicates that he moved to Iowa. This is a long answer to indicate that it could be the same line but I do not know. There are several male Caldwell's that I do not have info on.