|Marlene A. Eilers Koenig collection|
Leopold IV, Prince zur Lippe, (1871-1949) was married twice. His first marriage took place at Rotenburg on August 16, 1901 to Princess Bertha of Hesse-Philippsthal-Barchfeld (1874-1919). They had five children: Ernst-Leopold (1902-1987), Leopold (1904-1965), Karoline (1905-2001), Chlodwig (1909-2000) and Sieglinde (1915-2008.)
Bertha died on February 19, 1919 at Detmold. Leopold married for a second time on April 26, 1922 to Princess Anna zy Ysenburg und Budingen. Their only son, Prince Armin, who was born on August 18, 1924), succeed his father as Prince zur Lippe.
In October 1904, the then Count Leopold, regent for Lippe, was named as the legitimate successor to Prince Karl Alexander, who suffered from mental illness. Leopold had succeeded his father, Count Ernst, who had been regent for Karl Alexander until his death in January 1904.