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Early life

Leopold was born in Brussels on 9 April 1835, the second child of the reigning Belgian monarch, Leopold I, and of his second wife, Louise, the daughter of King Louis Philippe of France. The French Revolution of 1848 forced his maternal grandfather, Louis Philippe, to flee to the United Kingdom. Louis Philippe died two years later, in 1850. Leopold's fragile mother was deeply affected by the death of her father and her health deteriorated. She died of tuberculosis that same year, when Leopold was 15 years old.

Leopold's sister Charlotte became Empress Carlota of Mexico in the 1860s. The British monarch at the time, Queen Victoria, was Leopold II's first cousin, as was Victoria's husband, Prince Albert, since Leopold's father, Albert's father, Duke Ernest I of Saxe-Coburg-Gotha, and Victoria's mother, the then Duchess of Kent, were all siblings. As a young man, Leopold II served in the Belgian military and achieved the rank of lieutenant-general. He also served in the Belgian Senate during this time.