Princess Anastasia of Greece and Denmark
Princess Anastasia of Greece and Denmark ("née" Nonie May Stewart; 20 January 1878 – 29 August 1923) was an American-born heiress and member of the Greek Royal Family.
She was married to Prince Christopher of Greece and Denmark, the youngest child of King George I of Greece and his consort, Grand Duchess Olga Constantinovna of Russia, but was created a princess "suo jure".
Princess Irene of Greece and Denmark
Princess Irene of Greece and Denmark( born 11 May 1942) is the youngest child and second daughter of King Paul of Greece and his wife Princess Frederika of Hanover.
She is the younger sister of Queen Sofía of Spain and of the deposed King Constantine II of Greece and maternal aunt of Felipe VI of Spain.
Princess Theodora of Greece and Denmark (1906–1969)
Princess Theodora of Greece and Denmark( 30 May 1906 – 16 October 1969) was the second child and daughter of Prince Andrew of Greece and Denmark and Princess Alice of Battenberg, and the second eldest sister of Prince Philip, Duke of Edinburgh.
Princess Eugénie of Greece and Denmark
Princess Eugénie of Greece and Denmark( 10 February 1910 – 13 February 1989) was the youngest child and only daughter of Prince George of Greece and Denmark and his wife, Princess Marie Bonaparte, daughter of Marie- Félix Blanc and Prince Roland Bonaparte, a great- nephew of Napoleon I.
Her father was the second son of George I of Greece and Olga Constantinovna of Russia.
As a cousin of the bridegroom, she was a leading guest at the 1947 wedding of Princess Elizabeth and Philip, Duke of Edinburgh.
She authored" Le Tsarevitch, Enfant Martyr", a biography of Aleksey Nikolaevich, Tsarevich of Russia, written in French, which was published in 1990.
Princess Elizabeth of Greece and Denmark
Princess Elisabeth of Greece and Denmark( 24 May 1904 – 11 January 1955) was the middle daughter of Prince Nicholas of Greece and Grand Duchess Elena Vladimirovna of Russia.
Princess Marina of Greece and Denmark
Princess Marina of Greece and Denmark, (27 August 1968), later known as the Duchess of Kent, was a princess of the Greek royal house, who married Prince George, Duke of Kent, fourth son of King George V and Queen Mary in 1934.
They had three children:
Prince Edward, Duke of Kent, Princess Alexandra, and Prince Michael.
The Princess was widowed in 1942, when her husband was killed in a plane crash on active service.
In later life, she carried out many royal engagements, including the independence celebrations for Ghana and Botswana.
Princess Xenia Georgievna of Russia
Princess Xenia Georgievna of Russia( 22 August 1903, Mikhailovskoe, Russia – 17 September 1965, Glen Cove, New York) was the younger daughter of Grand Duke George Mihailovich of Russia and Princess Maria Georgievna of Greece and Denmark.
She was a granddaughter of George I of Greece and first cousin of the brothers King Alexander I of Greece, King George II of Greece, King Paul I of Greece and their sister Queen Helen, Queen Mother of Romania and also of Prince Philip, Duke of Edinburgh.
Princess Irene, Duchess of Aosta
Princess Irene of Greece and Denmark( 13 February 1904 – 15 April 1974) was the fifth child and second daughter of Constantine I of Greece and his wife, the former Princess Sophie of Prussia.
She was a member of the royal families of Greece and Italy.
From 1941 to 1943 she was also officially Queen Consort of Croatia.
Princess Margarita of Greece and Denmark
Princess Margarita of Greece and Denmark( 18 April 1905 – 24 April 1981) was the eldest child and daughter of Prince Andrew of Greece and Denmark and Princess Alice of Battenberg.
She was the first great- great- grandchild of Queen Victoria, and the eldest sister of Prince Philip, Duke of Edinburgh.
Prince George, Duke of Kent
Prince George, Duke of Kent, (George Edward Alexander Edmund; 20 December 1902 – 25 August 1942) was a member of the British royal family, the fourth son of King George V and Queen Mary.
He was the younger brother of Edward VIII and George VI.
He served in the Royal Navy in the 1920s and then briefly as a civil servant.
He became Duke of Kent in 1934.
In the late 1930s he served as an RAF officer, initially as a staff officer at RAF Training Command and then, from July 1941, as a staff officer in the Welfare Section of the RAF Inspector General's Staff.
He was killed in a military air-crash on 25 August 1942.
Both before and during his marriage, Prince George allegedly had a string of affairs, from socialites to Hollywood celebrities.

Question: When did Princess Marina Of Greece And Denmark's husband die?
Answer: 25 August 1942