Prince Karl Vladimir Ernst Heinrich of Leiningen (2 January 1928 – 28 September 1990) was the younger son of Karl, 6th Prince of Leiningen (1898–1946) and Grand Duchess Maria Kirillovna of Russia.
Maria was the daughter of Princess Victoria Melita of Edinburgh and Saxe-Coburg-Gotha and Cyril Vladimirovich, Grand Duke of Russia.
As such, Karl was a great-great-grandson of both Queen Victoria of Great Britain and Emperor Alexander II of Russia (as Victoria Melita and Cyril Vladimirovich were both grandchildren of Alexander II).