Overview
Lady Arbella Stuart (also Arabella, or Stewart; 1575 – 25 September 1615) was an English noblewoman who was considered a possible successor to Queen Elizabeth I of England. During the reign of King James VI and I (her first cousin), she married William Seymour, 2nd Duke of Somerset, another claimant to the English throne, in secret. King James imprisoned William Seymour and placed her under house arrest. When she and her husband tried to escape England, she was captured and imprisoned in the Tower of London, where she died at age 39.
Descent
She was the only child of Charles Stuart, 1st Earl of Lennox (of the third creation), by his marriage to Elizabeth Cavendish. She was a grandchild of Matthew Stewart, 4th Earl of Lennox (of the second creation) and Lady Margaret Douglas, the daughter and heiress of Archibald Douglas, 6th Earl of Angus, and of Margaret Tudor, daughter of King Henry VII of England and widow of King James IV of Scotland. Arbella was therefore a great-great-granddaughter of King Henry VII of England and was in line of succession to the English throne, although she did not herself aspire to it.
Her paternal grandparents, the 4th Earl of Lennox and Margaret Douglas, had, of their eight children, two sons who survived childhood: Arbella's father Charles and his older brother Henry Stuart, Lord Darnley, who became the second husband of Mary, Queen of Scots, and the father of Arbella's cousin James VI and I of Scotland, England and Ireland. Her maternal grandparents were Sir William Cavendish and his wife Elizabeth, better known as "Bess of Hardwick".
Childhood
From Wikipedia (CC BY-SA 4.0).