William Petty, 2nd Earl of Shelburne
…Secondly, to Lady Louisa FitzPatrick (1755 – 7 August 1789), daughter of the 1st Earl of Upper Ossory. They had at least one child: Henry Petty-Fitzmaurice, 3rd Marquess of Lansdowne (1780–1863), who succeeded his half-brother in the title. Lord Lansdowne's brother, The Hon. Thomas Fitzmaurice (1742–1793) of Cliveden, was also a…