Royal Profile: Duchess Donata von Oldenburg

Duchess Donata von Oldenburg was born 21 June 1950 as the third child and only daughter of Siegfried Casimir Friedrich Fürst zu Castell-Rüdenhausen  & Johanna Marie Gräfin zu Solms-Hohensolms-Lich {Source}. Her brothers, their wives and children are{Source}: 

1. Johann-Friedrich Graf zu Castell-Rüdenhausen (1948-)
1. Maria Johanna Gabriela Gräfin von Schönborn-Wiesentheid (1958-)
1. Otto Friedrich Graf zu Castell-Rüdenhausen (1985-)
2. Olga Graziella Gräfin zu Castell-Rüdenhausen (1987-)
3. Anne Magdalene Gräfin zu Castell-Rüdenhausen (1989-)
4. Anton Georg Friedrich Graf zu Castell-Rüdenhausen (1992-)
2. Manto Friedrich Graf zu Castell-Rüdenhausen (1949-)
1. Eva Lorenz Gräfin zu Castell-Rüdenhausen (1964-)
1. Marie Karoline Johanna Mechtild Gräfin zu Castell-Rüdenhausen (1985-)
3. Christian Friedrich Casimir Graf zu Castell-Rüdenhausen (1952-)
1. Carolina Hintzen (1952-)
1. Jurriaan George Frederik Graf zu Castell-Rüdenhausen (1978-)
2. Roderik Frederik Graf zu Castell-Rüdenhausen (1980-)
3. Clara Maria Gräfin zu Castell-Rüdenhausen (1983-)
4. Rupert Friedrich Graf zu Castell-Rüdenhausen (1954-)
1. Philipp Rupert Friedrich Franz Graf zu Castell-Rüdenhausen (1979-)
2. Leopold Rupert Friedrich Graf zu Castell-Rüdenhausen (1981-)
3. Sophia Marie Walpurgis Irene Gräfin zu Castell-Rüdenhausen  (1983-1987)
4. Gloria Donata Gräfin zu Castell-Rüdenhausen (1987-)
5. Karl Friedrich Graf zu Castell-Rüdenhausen (1957-)
6. Hermann Friedrich Graf zu Castell-Rüdenhausen (1963-)
1. Christine Henriette Prinzessin zu Waldeck und Pyrmont (1963-)
1. Annabelle-Florentia Gräfin zu Castell-Rüdenhausen (1991-)
2. Cecily Viktoria Gräfin zu Castell-Rüdenhausen (1992-)
3. Casimir Friedrich Wilhelm Graf zu Castell-Rüdenhausen (1994-)
7. Matthias Georg Friedrich Graf zu Castell-Rüdenhausen (1966-)
1.  Christine Blau

On 23 May 1975, she married Ludwug Ferdinand, Prinz vonPreußen. Together, they would have two children, and eventually a daughter in law, two grandsons and a granddaughter{Source}. Louis Ferdinand would pre-decease her in 1978, during a military training accident {Source}. She would continue on, raising a special needs daughter and her son on her own. She would remarry  Friedrich August Wilhelm Christian Ernst von Holstein-Gottorp, Duke of Oldenburg on 9 February 1991{Source}. They had no children together.

She is survived by her son, daughter, daughter-in-law, two grandsons and a granddaughter, as well as her second husband. Her survivors by name are:

1. Friedrich August Wilhelm Christian Ernst von Holstein-Gottorp, Duke of Oldenburg (stepfather of those listed below) 
1. Georg Friedrich, Prinz von Preußen (1976) 
1. Sophie, Prinzessin von Preußen, Prinzessin von Isenburg (1976) 
1. Carl Friedrich, Prinz von Preußen (2013) 
2. Louis Ferdinand, Prinz von Preußen (2013) 
3. Emma Marie, Prinzessin von Preußen (2015) 
2. Cornelie-Cécile Prinzessin von Preußen (1978)

The Duchess von Oldenburg died on 5 September 2015, after a lengthy illness, according to a statement released by her family {Source}.