Princess Herzeleide with her parents and brothers, c. 1925.
Countess Herzeleide of Ruppin was born on Christmas Day 1918, shortly after the fall of the German Empire and the collapse of the monarchy. She was consequently given the name Herzeleide because it meant "heart's sorrow". Herzeleide had three brothers: Princes Oscar, Burchard, and Wilhelm-Karl. Herzeleide and her brothers became Prince/Princess of Prussia on 21 June 1920 when their parents marriage was recognised as dynastic.
On 15 August 1938 in PotsdamGarrison Church, nineteen-year-old Herzeleide married thirty-one-year-old Karl Biron, Prince of Courland. Karl was the eldest son and heir of Prince Gustav Biron of Courland, descendants of a noble and former ruling Biron family. Along with the bride and groom's parents in attendee were former German Crown Prince Wilhelm, along with Emperor Wilhelm's wife Hermine Reuss of Greiz. Herzeleide wore a white silk gown with a headdress trimmed with myrtle, while all the male guests wore uniforms of the former German army. The couple planned to stop at Doorn on their honeymoon to visit Emperor Wilhelm.