Lord William Beauclerk (1766-1825) was the son of Aubrey Beauclerk, 5th Duke of St. Albans, and was the fourth of his parents' seven children. He was a great-great-grandson of King Charles II by Charles's mistress Nell Gwyn.
William's brother Aubrey had originally inherited the title of duke, becoming the 6th Duke. Aubrey died in 1815 and left the title to his son (also named Aubrey) who died within the year, still in infancy. The title then passed back to Uncle William, who thus became the 8th Duke of St. Albans.
In 1791, William married Charlotte Thelwell, who died in 1797. He married again in 1799 to Maria Janetta Nelthorpe who gave him thirteen children.
In 1825, William died at age 58. William Aubrey de Vere Beauclerk, his firstborn son, inherited as the 9th Duke of St. Albans.
Birth - Name: William Beauclerk Gender: Male Birth Date: 17 Dec 1766 Baptism Date: 14 Jan 1767 Baptism Place: Saint Mary-St Marylebone Road,St Marylebone,London,England Father: Aubrey Beauclerk Mother: Catherine Ponsonby Ancestry.co.uk
Marriage - Name: William Beauclerk Gender: Male Marriage Date: 1791 Marriage Place: Gautby, Lincolnshire, England Spouse: Charlotte Carter Thelwall FHL Film Number: 1542179 Reference ID: 2:3HSS7Z4 Ancestry.co.uk
Marriage - Name: Lord Wm Beauclerk Marriage Date: May 1799 Marriage Place: Louth Spouse: Miss Nelthorpe Father: Beauclerk Record Type: Marriage Title: Irish Marriages in Walker's Hibernian Magazine, 1771-1812, Vol. I (A-J) Ancestry.co.uk
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It may be possible to confirm family relationships with William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: