Richard von Weizsäcker was born on 15 April 1920 in the New Palace in Stuttgart, the son of diplomat Ernst von Weizsäcker, a member of the Weizsäcker family, and his wife Marianne von Graevenitz, a daughter of Friedrich von Graevenitz (1861-1922), a General of the Infantry of the Kingdom of Württemberg. Ernst von Weizsäcker was a career diplomat and a high-ranking official in the Foreign Ministry in the 1930s. The youngest of four children, Weizsäcker had two brothers, the physicist and philosopher Carl Friedrich von Weizsäcker and Heinrich von Weizsäcker who fell as a soldier in Poland at the beginning of World War II. The sister Adelheid (1916–2004) married Botho-Ernst Graf zu Eulenburg-Wicken (1903–1944), a land owner in East Prussia. Richard's grandfather Karl von Weizsäcker had been Prime Minister of the Kingdom of Württemberg, and was ennobled in 1897 and raised to the hereditary title of Baron ("Freiherr") in 1916. His term in office ended in 1918, shortly before the monarchy was abolished in the German Revolution of 1918–1919. However, during the following years, he still occupied an apartment in the former royal palace where his grandson was born in an attic room.