My great great grandfather William B. Robertson married Margaret Franklin in Madison Co., AL in
August of 1816. He died by June of 1832. Minor children named in a land record in 1835 were John, William, Julius, Minerva, Elijah Franklin, Smith and Thomas Morris Robertson. The family lived adjacent to Elijah and Elizabeth Franklin, adjacent to the TN border and Lincoln Co., TN. The family moved on to MS, LA, and ARK. No proof as to the parents of William Robertson, believed to have come from TN.

My Robertsons were still in MD in 1816, so far as I know, but they died in the Huntsville area. Henry Murray Robertson died in May, 1868. His son John Murray Robertson died in 1909. If you think they might be connected, I can give you additional family names.