Melusina von der Schulenburg, Countess of Walsingham
Petronilla Melusina von der Schulenburg, Countess of Walsingham (1 April 1693 – 16 September 1778) was the natural daughter of King George I of Great Britain and his longtime mistress, Melusine von der Schulenburg, Duchess of Kendal.
The couple had no children, but it is said that "family letters" suggest that Melusina may have been the mother, through an intimacy with Charles Calvert, 5th Baron Baltimore, of Benedict Swingate Calvert. Calvert was born in England in around 1730–32, the illegitimate son of Charles Calvert, 5th Baron Baltimore. His mother's identity is otherwise unknown.
- Rosalie Stier Calvert (February 1992). Mistress of Riversdale: The Plantation Letters of Rosalie Stier Calvert, 1795-1821. JHU Press. p. 270. ISBN 978-0-8018-4399-0.
- Washington, p.176
- Washington, George Sydney Horace Lee, p. 176, "The Royal Stuarts in America" New England Historical and Genealogical Register (July 1950).