Is this the Peter Alexander (ca. 1783-1856) who was the son of William Alexander and Frankey Rucker? I have found one mention of his marriage to Nancy Shackleford (dau. of Henry), but no date for the marriage or her death. Most of his adult life he spent with Elizabeth Banks and they are buried side by side in Elberton.
Nancy ______ was the name of William's second wife, mother of Mordica (his preferred spelling) who married Judith Shackelford, daughter of Edmund Shackelford, Rev. War soldier. I think that Henry and Edmund were brothers, but have not seen proof of this. tee