up by his father. By 1852, he "had fallen out with his father, the 3rd Marquess of Londonderry over their views on the land question [and] was obliged to retire because of these differences". Frederick Stewart married Lady Elizabeth Frances Charlotte Jocelyn, widow of Viscount Powerscourt and daughter of Robert Jocelyn, 3rd Earl of Roden, at the British Embassy in Paris on 2 May 1846. There were no children from the marriage. In 1855 his wife converted to Roman Catholicism. He succeeded his father in 1854 as the 4th Marquess of Londonderry. He built Scrabo Tower as a monument to the memory of his father. In 1857 he and his wife attended the ceremony of the laying of the foundation stone. Decline, death, and succession In 1862 Londonderry was diagnosed as mentally ill. He was secluded in a mental institution at White Rock Pavilion in Hastings. He died there on 25 November 1872, aged 67 and was buried in the Newtownards Priory. His wife, the dowager Marchioness of Londonderry died on 2 September 1884, aged 70, and was buried with him in the double grave in the priory. As he had no legitimate children, he was succeeded in the marquessate by his half-brother, George Vane-Tempest, 2nd Earl Vane. This had the effect that the fortunes of the Stewart and the Vane side of the Londonderry family were reunited in a single hand. Ancestry Notes and references Notes Citations Sources – (for his coat of arms) – (for Londonderry) – L to M (for Londonderry) External links 1805 births 1872 deaths Frederick Stewart Knights of St Patrick Lord-Lieutenants of Down Lords of the Admiralty 4 Castlereagh, Frederick Stewart, Viscount Members of the Privy Council of the United Kingdom People educated at Eton College Castlereagh, Frederick Stewart, Viscount Castlereagh, Frederick Stewart, Viscount Castlereagh, Frederick Stewart, Viscount Castlereagh, Frederick Stewart, Viscount Castlereagh, Frederick Stewart, Viscount Castlereagh, Frederick Stewart, Viscount Castlereagh, Frederick Stewart, Viscount Castlereagh, Frederick Stewart, Viscount Londonderry, M4 Frederick