Sir Marmaduke Beckwith, Baronet, the 2nd son of Elizabeth Jennings and Sir Roger Beckwith, Baronet, was born January 1687. 
He is thought to have emigrated to Virginia about 1700.
He was clerk of Richmond County, Virginia, from 1708 to 1740. 
Marmaduke married the young widow of Thomas Dickenson of Richmond, Virginia, who died in 1714/15. 
Marmaduke married Elizabeth Brockenbrough,  and they had three or four sons, Tarpley, Jonathan, Knt. [4th Baronet], Marmaduke, and probably Roger, and three or four daughters, Elizabeth, Margaret, (wife of Joseph Morton), and Mary, (wife of Lawrence Butler), and Penelope (wife of Alexander Walker)
"A descendant of Sir Hercules and Lady Beckwith Bruce, Sir Roger of Aldborough, Yorkshire, was bestowed a baronetcy for his service to King Charles II. His wife was Elizabeth Jennings, daughter of Sir Edmund Jennings, knight. The title passed to a son, Robert II, a mayor of Leeds and High Sheriff of Yorkshire.
"Upon his death in 1743, leaving no male heirs, the title went to his younger brother, Marmaduke, born in 1687, who had moved to Virginia to seek his fortune, as had his cousin, the Honorable Edmund Jennings, President of the Council of Virginia."
↑ 1.01.11.21.31.4Magna Carta Ancestry: A Study in Colonial and Medieval Families
The Virginia Genealogist. Washington, DC: J. F. Dorman, 1957 - 2006. (Online database. AmericanAncestors.org. New England Historic Genealogical Society, 2009.) The Myth of Henry Dickenson, Emigrant, Mrs. Mary Jane Knisely, Vol. 18, page 248.
The New England Historical and Genealogical Register. Boston, MA: New England Historic Genealogical Society, 1847-. (Online database: AmericanAncestors.org, New England Historic Genealogical Society, 2001-2013.) A Roll of Arms, Vol. 125, page 263
Morton, Daniel: Morton Data in VMHB. Shows a daughter Rebecca and some dates.
Thank you to Brian Williams for creating WikiTree profile Beckwith-384 through the import of Gurkins.ged on Aug 12, 2013. Click to the Changes page for the details of edits by Brian and others.