Title: Edgar Stuart, Duke of Cambridge
Content:  Edgar Stuart, Duke of Cambridge (14 September 1667 – 8 June 1671) was the fourth son of James, Duke of York (later James II of England) and his first wife Anne Hyde. He was second in the line of succession to the English and Scottish thrones.
Title: Edgar Stuart, Duke of Cambridge
Content:  Edgar was born on 14 September 1667 at St James's Palace and baptized there with the Duke of Albemarle, the Marquis of Worcester, and the Countess of Suffolk as sponsors. The name "Edgar" had ancient roots in both the English (Edgar the Peaceful) and Scottish (Edgar, King of Scotland) monarchies. On 7 October 1667 he was created Duke and Earl of Cambridge and Baron of Dauntsey. His elder brother Charles had died at the age of six months in 1661 before the patent for the title of Duke of Cambridge was passed and another brother, James was formally created Duke 
Title: Edgar Stuart, Duke of Cambridge
Content:  Cambridge before his death in 1667 at the age of three. Edgar's titles became extinct until the birth of another son, also named Charles, in 1677. His mother was ill for months following his birth and never fully recovered, though she gave birth twice more to daughters who died before their first birthdays; she died on 13 March 1671. Edgar died at Richmond Palace on 8 June 1671 leading to official mourning. He was entombed in the royal vault in the Henry VII Chapel in Westminster Abbey on 12 June 1671, his coffin placed atop that of his mother.
Title: Duke of Cambridge
Content: Edgar Stuart House of Stuart 1667–1671  also: Earl of Cambridge and Baron of Dauntsey (1667)  ; 14 September 1667 St James's Palace, London son of James, Duke of York (later King James II) and Anne Hyde ; not married ; 8 June 1671 Richmond Palace, London aged 3 8 June 1671 Richmond Palace, London aged 3 }  
Title: Baron of Dauntsey
Content: Edgar Stuart, Duke of Cambridge (1667–1671) 
Title: Edgar Stuart, Duke of Cambridge
Content:   Edgar bore a coat of arms, as a grandson of a British Sovereign, consisting those of the kingdom, differenced by a label argent of five points ermine.
Title: Earl of Cambridge
Content: Edgar Stuart, Duke of Cambridge (1667–1671) 
Title: Charles Stuart, Duke of Cambridge (1677)
Content:  Charles Stuart (7 November 1677 – 12 December 1677) was the first of two sons and third of seven children born from the marriage between James, Duke of York (later James II of England & VII of Scotland) and Mary of Modena. He was styled Duke of Cambridge, but never formally created so, because he died so young.
Title: Arthur Stuart, 7th Earl Castle Stewart
Content:  Stuart was the third son of Andrew John Stuart, 6th Earl Castle Stewart, an Ulster Scots nobleman, and his wife, Emma Georgiana Diana, the youngest daughter of Major-General Arthur Stevens (1821–1895) of the Madras Native Infantry and his second wife (of five), Georgiana Eliza Dickson, a descendant of John Sheffield, 1st Duke of Buckingham and Normanby. The Stuart family descends in the male line from King Robert II of Scotland. He was educated at Charterhouse, Trinity College, Cambridge and the University of Paris.
Title: James Stuart, Duke of Cambridge
Content:  James Stuart, Duke of Cambridge KG (12 July 1663 – 20 June 1667) was the second son of the Duke of York (later James II of England) and his first wife, Anne Hyde. In 1664, the infant James became the first Duke of Cambridge and Baron of Dauntsey, titles his uncle, King Charles II, created especially for him. The King also appointed Cambridge a Knight of the Garter, but never invested him due to his untimely death. Cambridge received a yearly pension of £3,000 from the king. Had Cambridge survived his early years, he would have been the first Protestant in the line of succession to the crown, ahead of his sisters Mary and Anne, when the "Glorious Revolution" of 1688 deposed his father and insisted on a Protestant succession.

Question: Who is the mother of Edgar Stuart, Duke of Cambridge?
Answer: Anne Hyde.