Background
She was the daughter of Siegfried, 4th Prince of Castell-Rüdenhausen (1916-2007), head of the Rüdenhausen branch of the House of Castell, and his wife, Countess Irene of Solms-Laubach (1925-2006). Countess Donata of Castell-Rüdenhausen was born on 20 June 1950 at the Castle of Rüdenhausen, Unterfranken, Germany to Siegfried, 4th Prince of Castell-Rüdenhausen (1916-2007), head of the Rüdenhausen branch of the House of Castell and his wife Countess Irene of Solms-Laubach (1925-2006). Donata was the third born child of her parents and the only daughter of eight children.
Career
She was the mother of Prince Georg Friedrich of Prussia (born 1976) the current head of the House of Hohenzollern, the ruling dynasty of the German Empire and of the Kingdom of Prussia until 1918. She was raised Lutheran. After Abitur at Wiesentheider Gymnasium she made an apprenticeship of three years as a nurse at the German-Red-Cross-Hospital in Würzburg.
After wedding the young couple lived in Bremen, where Louis Ferdinand worked at a Bank.
Prince Georg Friedrich of Prussia (born 10 June 1976 in Bremen), the current head of the House of Hohenzollern, the former ruling dynasty of the German Empire and of the Kingdom of Prussia until 1918, married on 27 August 2011 at the Church of Peace in Potsdam Princess Sophie of Isenburg. On 20 January 2013, Sophie gave birth to twin sons, the elder of the two, Carl Friedrich, is the heir apparent to the House of Hohenzollern.
On 2 April 2015 she gave birth to a daughter. Prince Carl Friedrich of Prussia (born 20 January 2013 in Bremen)
Prince Louis Ferdinand of Prussia (born 20 January 2013 in Bremen)
Princess Emma Marie of Prussia (born 2 April 2015 in Bremen)
Princess Cornelie-Cécile of Prussia (born on January 30, 1978 in Bremen, after her father has died).
She was born developmentally disabled.
Her husband Louis Ferdinand in 1967 volunteered to serve in the West German Army (Bundeswehr) with the goal of becoming a reserve officer In 1972 he started an apprenticeship at a bank and continued to serve his military duties on a regular basis. In 1977 he was involved in a severe accident during military maneuvers when he was pinned between two vehicles.
Although his leg was amputated, he succumbed several weeks later to the trauma and died on July 11, 1977 in Bremen.
On 9 February 1991 Donata remarried Duke Friedrich August of Oldenburg (born 1936) at Lutheran Saint Peter and Paul Church in Rüdenhausen. Marie Cécile was the sister of Donata"s late husband Louis Ferdinand.
They did not have children together. Donata died in Traunstein, Oberbayern, on 5 September 2015 after a long illness aged 65.
She was interred in the Mausoleum of the Grand Ducal Family of Oldenburg at the Gertrudenfriedhof in Oldenburg.
1950-1975: Her Illustrious Highness Countess Donata of Castell Rüdenhausen
1975-1991: Her Imperial and Royal Highness Princess Louis Ferdinand of Prussia
1991-2015: Her Highness Duchess Friedrich August of Oldenburg.
