he was one of the richest men in the United Kingdom with a fortune of £12 million (then $60 million in face value, then more than about 20–30 times current purchasing power). This accumulation of wealth was due to his level-headedness and attention to detail. In contrast, Beit was shrewd but impulsive, leading to fiascos like the Jameson Raid. Art Wernher kept his art collection at his London mansion, Bath House in Piccadilly, and at his country house Luton Hoo (occupied by Robert de Hoo in 1245). Much of it is now on display at Ranger's House in the London suburb of Greenwich. In 1897 Wernher bought what was thought to be a later copy of the Madonna of the Pomegranate; the original was painted by Sandro Botticelli in 1487. Restoration work carried out by English Heritage, and extensive testing, have shown that the painting at Ranger's House did in fact originate from Botticelli's 15th Century workshop in Florence. A large memorial to Wernher now flanks the entrance to the Royal School of Mines in London. Marriage and children On 12 June 1888, he married socialite Alice Sedgwick Mankiewicz (1862 – 30 November 1945), nicknamed "Birdie", whom he described as "bright-eyed, fair-haired, small, intelligent and musical". She was the daughter of Jacob "James" Mankiewicz (1830–1879) from Danzig, the son of Joel Mankiewicz, a Polish Jewish merchant. Her mother was Ada Susan Pigott from Colchester, who had a brother who was a general. Birdie and her mother lived in part of a big mid-Victorian house in Bayswater, at 15a Pembridge Square. They had three sons: Sir Derrick Julius Wernher, 2nd Baronet (7 June 1889 – 6 March 1948), married Theodora Anna Romanoff, daughter of Nikita Romanoff (from an exiled Russian noble family – not related to the Imperial House of Romanov—whose members were in charge of the enterprise Sibirsky telegraf, "The Siberian Telegraph", in 1861), on 14 December 1922. Anna Alexandra Wernher (14 May 1924 – May 2010) Major-General Sir Harold Augustus Wernher, 3rd Baronet (16 January 1893 – 30 June 1973), married Countess Anastasia de Torby (9 September 1892 – 7 December 1977), eldest child of Grand Duke Michael Mikhailovich of Russia and his morganatic wife, Sophie of Merenberg, Countess de Torby, daughter of Prince Nikolaus Wilhelm of Nassau and his morganatic wife, Russian noblewoman Natalia Pushkina. Captain George Michael Alexander Wernher (Edinburgh, Scotland, 22 August 1918 – Béja, Tunisia,