not well regarded as he made a spectacle of himself with his loutish behaviour, was apparently rather often inebriated, and frequented prostitutes quite openly. He earned himself the sobriquet of Lord Pumpernickel after a loutish character in a play in fashion. Second marriage and children Before the end of his diplomatic career Lord Stewart had, on 3 April 1819, married his second wife, Lady Frances Anne Vane-Tempest, daughter and heiress of Sir Henry Vane-Tempest, at her mother's house in Bruton Street, Mayfair, and took her surname of Vane, by Royal licence, as had been stipulated in her father's will. He was henceforth known as Charles William Vane, whereas his son out of his first marriage stayed Frederick Stewart. Children by Frances Anne Emily Vane-Tempest: George Henry Robert Charles William Vane-Tempest, 5th Marquess of Londonderry (1821–1884) Lady Frances Anne Emily Vane (1822–1899); married John Spencer-Churchill, 7th Duke of Marlborough. Lady Alexandrina Octavia Maria Vane (1823–1874), godchild of Alexander I of Russia; married Henry Dawson-Damer, 3rd Earl of Portarlington. Lord Adolphus Frederick Charles William Vane-Tempest (1825–1864), politician; became insane, and had to be medically restrained. Lady Adelaide Emelina Caroline Vane (c. 1830–1882); disgraced the family by eloping with her brother's tutor, Rev. Frederick Henry Law. Lord Ernest McDonnell Vane-Tempest (1836–1885), fell in with a press-gang and had to be bought a commission in the army, from which he was subsequently cashiered. Through his daughter Lady Frances, Lord Londonderry is the maternal grandfather of Lord Randolph Churchill, and consequently a great-grandfather of Winston Churchill. Castlereagh's suicide On 12 August 1822, his half-brother committed suicide. He succeeded his half-brother as 3rd Marquess of Londonderry in 1822. The following year Lord Londonderry was also created Earl Vane and Viscount Seaham, of Seaham in the County Palatine of Durham, with remainder to the heirs male of the body of his second wife. His half-brother's death also meant the end of his diplomatic career. He quit the diplomatic service in 1823. Queen Victoria had a low esteem of Londonderry's abilities as a civil servant. She said that he should, in her opinion, not be given any post of importance. Residences Lord Londonderry used his new bride's immense wealth to acquire the Seaham Hall estate in County Durham, developing the coalfields there. He also built the harbour at Seaham, to rival nearby Sunderland. He commissioned Benjamin Wyatt to build a mansion at Wynyard Park. It was completed by