Richard Casimir Karl August Robert Konstantin was the eldest son and child of Gustav Albrecht, 5th Prince of Sayn-Wittgenstein-Berleburg, a highly decorated German army officer declared missing in 1944 yet only legally declared dead in 1969, and his wife, Margareta Fouché d'Otrante, a descendant of Napoleonic statesman Joseph Fouché, Duke d'Otrante.

He took post-graduate training as Forstreferendar, obtaining a degree as Assessor des Forstdienstes after passing the second-level examination at the North Rhine Westphalian State Forestry Service.

[4] While the couple were raising their family Princess Benedikte reduced her royal engagements in Denmark, where she spent only about a quarter of her time.

[4] Prince Richard engaged in several conservation programmes, while responsible for managing his family's extensive lands in Germany.

[4] He launched a project to re-introduce European bison to the native continent on part of his 32,000 acre estate in North Rhine-Westphalia, credited as a success by Rewilding Europe as part of a larger effort to restore depleted animals across Europe.