Prince Leopold of Belgium, Duke of Brabant, Count of Hainaut (Léopold Ferdinand Élie Victor Albert Marie (French) or Leopold Ferdinand Elias Viktor Albert Maria (Dutch); 12 June 1859 in Laeken – 22 January 1869 in Laeken or Brussels), was the second child and only son and heir apparent of Leopold II of Belgium and his wife, Archduchess Marie Henriette of Austria.

Leopold was named for his grandfather, and for his father's cousins, Prince Ferdinand of Saxe-Coburg and Gotha, and Prince Albert, the Prince Consort.

At birth, Leopold was styled Count of Hainaut, as the eldest son of the then crown prince. At the time of his birth, his grandfather, Leopold I of Belgium, formerly a Prince of Saxe-Coburg and Gotha, was the reigning king of Belgium.

Leopold was preceded in birth by one sister, Louise, and followed by two more sisters, Stéphanie, and Clémentine, who was born after Leopold's death, their parents' last hope for another son.

Upon the death of his grandfather and the ascension of his father to the throne in 1865, young Leopold became Duke of Brabant, the title for the heir-apparent to the Belgian throne. As heir-apparent, he was expected to eventually succeed his father as King Leopold III of the Belgians.

Leopold died at Laeken or Brussels on 22 January 1869 from pneumonia, after falling into a pond. At his son's funeral, Leopold II "broke down in public, collapsing to his knees beside the coffin and sobbing uncontrollably." Leopold's body was interred at the royal vault at the Church of Our Lady of Laeken in Brussels.

...
Wikipedia