Edgar Stuart was born on 14 September 1667 at St. James's Palace,  the son of James, Duke of York, heir to the throne of his brother, Charles II and of James's wife, Anne Hyde. The baby was Christened on 16 September, George Monck Duke of Albemarle and Henry Somerset the new Marquess of Worcester were godfathers and Barbara, Countess of Suffolk was godmother.  Less than a month after his birth, on 7 October, he was created Duke of Cambridge, Baron Dauntsey and Earl of Cambridge. 
Throughout his life he was second in the line of succession to the throne, his three older brothers having died before he was born.
Edgar died on 8 June 1671 aged 3 at Richmond Palace and was buried on 12 June 1671 in Westminster Abbey. 
↑ The Diary of Samuel Pepys 16 September 1671 ".......the Duke of York's child is christened, the Duke of Albemarle and the Marquess of Worcester godfathers, and my Lady Suffolke godmother; and they have named it Edgar, which is a brave name. But it seems that they are more joyful in the Chancellor's family, at the birth of this Prince, than in wisdom they should, for fear it should give the King cause of jealousy."
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It may be possible to confirm family relationships with Edgar by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: