Duchess Alexandrine of Mecklenburg-Schwerin (24 December 1879 – 28 December 1952), who married King Christian X of Denmark on 26 April 1898. They had two sons. They had two sons. Frederick Francis IV, Grand Duke of Mecklenburg (9 April 1882 – 17 November 1945), who married Princess Alexandra of Hanover on 7 June 1904.
Biography. He was born in Schloss Ludwigslust, the eldest son of Hereditary Grand Duke Paul Friedrich of Mecklenburg-Schwerin and his wife Princess Alexandrine of Prussia.He became heir apparent to the grand duchy following the death of his great-grandfather Frederick Francis I on 1 February 1837.