I haven't read all the responses to your message, but I put in a few key words and nothing turned up to indicate this information had been sent to you.In the book "Side-Lights on Maryland History" by Hester Dorsey Richardson (which was apparently written in 1903) is the following:
"William Richardson married Elizabeth Ewen, the daughter of Major Richard Ewen, one of the Commissioners to govern Maryland under Oliver Cromwell.She was the widow of Richard talbot, of Anne Arundel County.Major Richard Ewen, father-in-law of William Richardson, was one of the Council of War after the battle of the Severn, which condemned Governor Stone (my ancestor) and others to die."
"The proof of the marriage of Elizabeth Ewen to Richard talbot is found in Annapolis Land Records, Liber 4, folio 66, where it is recorded that on August 4, 1659, 'Major Richard Ewen assigneth the right of 50 acres of land to his son-in-law Richard talbot.'That William Richardson married Elizabeth, the executrix of Richard talbot, of Anne Arundel County, prior to 1677, is shown in Annapolis Records, Liber 19, folio 615."
There is further informatiion on these people, if needed.The author stated that a "fuller history of the Richardsons, of Maryland, is now in preparation and is too voluminous to give here."