Princess Anna of Montenegro
Princess Anna of Montenegro( 18 August 1873 – 22 April 1971) was the seventh child and sixth daughter of Nicholas I of Montenegro and his wife Milena Vukotić.
Bruno, Prince of Ysenburg and Büdingen
" Bruno" Casimir Albert Emil Ferdinand of Ysenburg and Büdingen( 14 June 1837 – 26 January 1906) was the third Prince of Ysenburg and Büdingen.
Bruno was the eldest son of Ernst Casimir II, 2nd Prince of Ysenburg and Büdingen and his wife Countess Thekla of Erbach- Fürstenau.
Ernst Casimir II, Prince of Ysenburg and Büdingen
" Ernst Casimir II" of Ysenburg and Büdingen( 14 December 1806, Büdingen – 16 February 1861, Büdingen) was the second Prince of Ysenburg and Büdingen.
Ernst Casimir was the eldest son and second eldest child of Ernst Casimir I, 1st Prince of Ysenburg and Büdingen and his wife Countess Ferdinande of Erbach- Schönberg.
Princess Anna of Hesse and by Rhine
Princess Anna of Hesse and by Rhine (25 May 1843 – 16 April 1865) was the consort and second wife of Friedrich Franz II, Grand Duke of Mecklenburg-Schwerin.
Wolfgang-Ernst, Prince of Ysenburg and Büdingen
Wolfgang- Ernst Ferdinand Heinrich Franz Karl Georg Wilhelm, VIII.
Prince of Ysenburg and Büdingen in Wächtersbach( born 20 June 1936 in Frankfurt am Main) is a German aristocrat.
He is currently head of the House of Ysenburg and Büdingen.
From 1992 to 2008 he was the president of the" Automobilclub von Deutschland"( AvD).
He is a diploma-merchant and was responsible for the private clients transactions of the" DG- Bank" for many years.
Princess Elisabeth of Stolberg-Rossla
Princess Elisabeth of Stolberg- Rossla( 23 July 1885, Roßla -- 16 October 1969, Eutin, Schleswig- Holstein) was the second wife of Duke Johann Albrecht of Mecklenburg, Regent of the Duchy of Brunswick.
The daughter of Prince and Princess Hedwig of Ysenburg and Büdingen( eldest daughter of Bruno, 3rd Prince of Ysenburg and Büdingen), she was married to Johann Albrecht on 15 December 1909, a year after the death of his first wife.
Their marriage was childless.
After his death in 1920, Elisabeth remarried to Duke Adolf Friedrich of Mecklenburg, her first husband's half- brother, at Ludwigslust in( Groß) Herzogtum Mecklenburg- Schwerin.
She died in Eutin, Schleswig- Holstein, on 16 October 1969, two months after the death of her second husband.
Princess Anna of Ysenburg and Büdingen
Princess Anna of Ysenburg and Büdingen (10 February 1886, Büdingen – 8 February 1980, Detmold) was the youngest child of Bruno, 3rd Prince of Ysenburg and Büdingen and his wife, Countess Bertha of Castell-Rüdenhausen.
Through her second marriage to Leopold IV, Prince of Lippe, Anna was the titular Princess consort of Lippe.
Princess Anna of Bavaria
Princess Anna of Bavaria( née; Princess Anna- Natascha zu Sayn- Wittgenstein- Berleburg; born 15 March 1978) is a German journalist and author.
A member of the House of Sayn- Wittgenstein- Berleburg by birth, she became a member of the House of Wittelsbach in 2005 through her marriage to Prince Manuel of Bavaria.
Armin, Prince of Lippe
Armin, Prince of Lippe(" Armin Leopold Ernst Bruno Heinrich Willa August Fürst zur Lippe"; 18 August 1924 – 20 August 2015, also in Detmold) was the son of Leopold IV, Prince of Lippe and his second wife, Princess Anna of Ysenburg and Büdingen.
Leopold IV, Prince of Lippe
Leopold IV, Prince of Lippe ("Leopold Julius Bernhard Adalbert Otto Karl Gustav"; 30 May 1871 – 30 December 1949) was the final sovereign of the Principality of Lippe.
Succeeding to the throne in 1905 he had been governing the state since 1904 as regent.

Question: When did Princess Anna Of Ysenburg And Büdingen's husband die?
Answer: 30 December 1949