Ernest Cassel

Cassel was born in Cologne, in the Rhine Province of the Kingdom of Prussia (now part of Germany), the son of Amalia (née Rosenheim) and Jacob Cassel. His family were Ashkenazi Jews. His father owned a small bank, but the son Ernest arrived penniless in Liverpool, England in 1869. There he found employment with a firm of grain merchants. With an enormous capacity for hard work and a strong business sense, Cassel was soon in Paris working for a bank. Being of Prussian origin, the Franco-Prussian War forced him to move to a position in a London bank. He prospered, and was soon putting together his own financial deals.

His areas of interest were in mining, infrastructure and heavy industry. Turkey was an early area of business ventures, but he soon had large interests in Sweden, the United States, South America, South Africa, and Egypt. He was among the financiers of the Aswan Dam, built in Egypt between 1899 and 1902, and was present in Egypt at the opening of the dam in December 1902.

At the behest of the French and British governments, he reluctantly provided assistance for the establishment of the State Bank of Morocco, provided for in the terms of the 1906 Treaty of Algeciras.

In 1912 his close German friend Albert Ballin feared that the naval rivalry between Britain and Germany was getting out of hand and even threatened war. They approached their respective governments, who agreed to negotiate a compromise that would end the race through the Haldane Mission of 1912. Unfortunately, it proved a failure.

One of the wealthiest men of his day, Cassel was a good friend of King Edward VII (enough so that he was nicknamed "Windsor Cassel"), prime minister H. H. Asquith and Winston Churchill. As a foreign-born arriviste of Jewish background, he was less than popular with elements of the British upper classes.

Cassel was married at Westminster, in 1878, to Annette Mary Maud Maxwell, the daughter of a Catholic landowner. Their only child, Amalia Mary Maud Cassel (1880–1911), known as "Maud", married Wilfrid Ashley, 1st Baron Mount Temple.

After the early death of his wife Annette in 1881, he and his widowed sister Wilhelmina (known as Bobbie) helped each other bring up his daughter (Maud) and Wilhelmina's son (Felix) and daughter (Anna).

Maud died as a young woman, leaving him two granddaughters (Edwina and Mary) on whom he doted. He was particularly attached to Edwina, who looked after him in his old age. She later married Lord Louis Mountbatten.

Cassel's nephew was the barrister Sir Felix Cassel, who later became Judge Advocate-General to the Forces.

Cassel became a Roman Catholic at the behest of his wife, but many still considered him a Jew. The establishment was surprised to find out that he had converted when he chose to be sworn into the Privy Council with the Douay–Rheims Bible.