Barbara, I wish I could find a connection with your Riddle family. We have a Samuel Riddle born around 1790 who married a Anna/Nancy Clarvo around 1820. We know Anna's family came from Maryland- Prince George County- but we don't know the whereabouts of Sam. We connect up with them in Scott County, KY- in White Sulphur- where a number of Maryland families had immigrated. Research into Riddle families in Maryland have proven fruitless in finding Samuel's roots. If you find him in any of your research, we would be greatly appreciative. Sue Larson and Mike Conners