Princess Clementine of Belgium (French: Clémentine Albertine Marie Léopoldine, or Dutch: Clementina Albertina Maria Leopoldina; 30 July 1872 – 8 March 1955) was the wife of Napoléon Victor Bonaparte, Bonapartist pretender to the throne of France (as Napoleon V).

Princess Clémentine was born in 1872 at the Royal Castle of Laeken, (north west Brussels); she was the third daughter, and last child, of King Leopold II of Belgium and Marie Henriette of Austria. She had two older sisters, Princess Louise, and Princess Stéphanie. Her brother, Prince Leopold, Duke of Brabant, had died of pneumonia in 1869, after having fallen into a pond. Leopold neglected Clementine and her older sisters, and had a strained relationship with his wife and children.

Clémentine was raised by her mother, who had, reportedly, a difficult temper. Her sisters married when she herself was quite young. Princess Louise had married in 1875 and Stephanie in 1881. However, once Clémentine came of age, she was given independence by her father to travel without her mother's approval. She later wrote, thanking her father, saying, "Thanks to you, dear father, I have been able to find happiness." However, the happy opportunity to travel ended when Clémentine's mother died in 1902, and Clémentine was obliged to assume the functions of a first lady at the Court of Brussels.

Throughout Clémentine's life she had three known romantic interests. The first was her cousin Prince Baudouin, eldest son of her uncle Prince Philippe, Count of Flanders, and heir to her own father after the death of her brother Leopold. Baudouin did not return Clémentine's affections and died in his early 20s. The second was Baron Auguste Goffinet, a member of the Belgian court. However the baron did not have 'royal' blood. The last love, which she never relinquished, was Prince Napoléon Victor Bonaparte, who had become heir to the Napoleonic empire after the death of his cousin Napoléon Eugène, Prince Imperial, son of the former Empress Eugénie.

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