question: Where was the father of Prince Boris Of Leiningen born?
context: Title: Prince Karl of Leiningen
  Passage: 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).
  Title: Prince Boris of Leiningen
  Passage: Prince Karl" Boris" Frank Markwart of Leiningen( born 17 April 1960) is the elder son of Prince Karl of Leiningen and of his wife, Princess Marie Louise of Bulgaria. As a third great- grandson of Queen Victoria, he is in the line of succession to the throne of Canada and those of the other Commonwealth realms.
answer: Coburg
citations: Prince Karl of Leiningen Prince Boris of Leiningen