William Bladen, Esq., born at Steeton, Yorkshire 27 Feb. 1673, immigrated to Maryland in 1690.  He settled in St. Mary's Co. and later at Annapolis, Anne Arundel Co.  He married in 1695 Anne Van Swearingen, daughter of Garrett Van Swearingen, by his wife, Mary Smith.  They had four sons, [Col.] Thomas [Governor of Maryland], William, Christopher, and Martin, and two daughters, Anne (wife of Benjamin Tasker) and Priscilla. William Bladen, Esq., died intestate at Annapolis, Maryland 7 August 1718.  His widow, Anne, was living Aug. 1719. 
OCCUPATION: Secretary of Maryland 1701, Attorney General 1707, and Commissary General 1714.
RESIDENCE: England and Anne Arundel Co. MD
BIRTH: 22 Feb 1673, Hemsworth, Yorkshire, England
DEATH: 9 Aug 1718, Anne Arundel Co. Maryland or Delaware
C. Ashley Ellefson in "William Bladen and Letitia Loftus: A Voyage in Search of a Wife and an Exercise in Genealogy"  strongly presents facts to disprove the contention of Charles Henry Browning in "Americans of Royal Descent: Collection of Genealogies Showing the Lineal ..." that William Bladen married Letitia Loftus. 
↑ William Bladen married Letitia Loftus, by whom he is said to have had issue (child). The proof of his 2nd. marriage to Ann Swearingen is the will of her mother; also the following Maryland records: "Feb 29, 1695-6. Ordered that the sheriff of St. Maries (Marys) county summon Mr. Hall, priest at St. Inigoes of said county, to appear before the Governor and Council at Annapolis, on the last day of April next, to answer by what authority he joined in marriage Mr. William Bladen and Mistress Ann Van Swearingen of St Marys county. (Liber H.D., folio 267, Council Journal). On 29 April 1696, Mr. Hall appeared before the court in Annapolis, and gave satisfactory answer (Ibid. 310). William Bladen was clerk of the house of Burgesses, 1697; Clerk of the Prerogative court, 1699; and Commissary-General of Maryland, 1714 (Browning, page 44)
Richardson, Douglas. Royal Ancestry: A Study In Colonial And Medieval Families, in 5 vols. (Salt Lake City, Utah, 2013): vol. 1 p. 380.
Browning, Charles H: Americans of Royal Descent, 7th edition (1911), p. 44.
Different sources give different birthplaces. What we appear to know is: Nathaniel Bladen was owner or co-owner of Hague Hall in Hemsworth; William was born in February 1672/3; he was baptised a month later at Steeton, the seat of his mother's family. Given the interval of a month, we don't know whether his mother went home for the birth, or only for the christening; neither practice was unusual.