The Marquess of Lansdowne is a title in the British peerage, created in 1784. The title is associated with the Lansdowne family, particularly known for their political influence and contributions to British society. The first Marquess, Henry Petty-Fitzmaurice, was a prominent statesman and served as Prime Minister in the 19th century. The Lansdowne estate, located in Wiltshire, includes the historic Lansdowne House in London, which has been a center for social and political gatherings. The title has been held by several notable figures, each contributing to the family's legacy in British history and politics.