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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 United Kingdom and those of the other Commonwealth realms.
Biography
Boris was born in Toronto, Ontario. He is the grandson of King Boris III of Bulgaria and the great-grandson of King Victor Emmanuel III of Italy. As a descendant of Queen Victoria of the United Kingdom, her great-great-great grandson, he is in the line of succession to the throne of Canada and those of the other Commonwealth realms. According to Marlene A. Eilers, Boris of Leiningen belongs to the orthodox creed, which means he is one of rare princely persons with a religiously-unhindered claim to some former monarchies which have eastern orthodox tradition, such as Russia and Bulgaria.
On 14 February 1987 in Westfield, New Jersey, Boris married Millena Manov (22 August 1962–20 November 2015). They have one son:
- Prince Nicholas of Leiningen (b. 25 October 1991, Philadelphia).
Boris and Millena were divorced in 1996.
On 11 September 1998 in Neptune City, New Jersey, Boris married Cheryl Riegler (born 9 August 1962), a Doctor of Nursing Practice. They have two children:
- Prince Karl Heinrich of Leiningen (b. 17 February 2001, Long Branch, New Jersey).
- Princess Juliana Elizabeth Maria of Leiningen (b. 19 September 2003, Long Branch, New Jersey).
Boris is currently Director of Business Development for Massa Montalto Architects in Neptune, New Jersey.
Dr. Cheryl Leiningen has a private practice and is a Professor at Monmouth University, West Long Branch, New Jersey.
Boris is active in cultural events involving the Bulgarian-American community, especially those related to the Holocaust. Boris and Cheryl are active marathon runners. Boris is also an avid motorcyclist.