Lady Mary Pakenham was born in 1776 and became known for her role in the British aristocracy. She was the daughter of Edward Pakenham, 2nd Baron Longford, and married Sir William Pakenham, who later became the 2nd Baron of the same name. Throughout her life, Lady Mary was involved in various social and charitable activities, reflecting the values of her time. She was part of a prominent family that played a significant role in the political and social landscape of 19th-century Britain. Lady Mary passed away in 1860, leaving behind a legacy tied to her family's history.