Sir Ralph Milbanke (1747-1825), 6th Baronet of Halnaby and MP for Durham, married Judith Noel (1751-1822), eldest daughter of 1st Viscount Wentworth in 1777. On the death of Judith's brother, Thomas Noel, 2nd Viscount Wentworth in 1815, Ralph and Judith changed their surname to Noel. They had only one child, Anne Isabella, known as Annabella (1792-1860), although they had previously adopted Sophie Curzon, the daughter of Judith's sister Sophia who died in 1782. Annabella Milbanke married the poet Lord Byron (1788-1824) in 1815 but the marriage was unhappy and the couple separated in 1816, having had one child, Ada, born the previous year. Annabella, a philanthropist and social reformer, brought her daughter up alone. She took the name Noel when her mother died in 1822 but continued to be known as Lady Byron. She became Baroness Wentworth in 1856 on the death of her cousin Nathaniel Curzon, Baron Scarsdale. Her daughter, Ada Byron (1815-1852), a mathematician and computer pioneer, married William King (1805-1893), 8th Baron King of Ockham in 1835. He was created Earl of Lovelace in 1838. They had three children: Byron Noel (1836-1862), Anne Isabelle Noel (1837-1917) and Ralph Gordon (1839-1906). The sons were successively Baron Wentworth, and the younger son, Ralph, succeeded his father as the 2nd Earl of Lovelace. Further biographical details can be found in the Oxford Dictionary of National Biography which has entries for Lady Byron, Lord Byron, Ada Lovelace and her daughter Anne Blunt.