Manlio Garibaldi was the youngest child of Freedom Fighter Giuseppe Garibaldi and Francesca Armosino. He was 3-years-old when his parents married. As his father and grandfather before him, he had a passion for the sea. This led him soon to join the Naval Academy of Livorno. In fact, he was one of the first cadets of the newly formed Academy in 1888. He was tall, large-framed, with dark eyes and hair; he made a handsome Navy officer. After graduation, he traveled to South America, England, and the United States to visit the places his father had lived.
In the last years of his life, his father wrote a novel "Manlio" It was about what a father, who was successful, expected from his son.
When his father died, Manlio and his sister Clelia inherited the house and grounds of Caprera located north of the "wall of Clara Emma Collins", who was the other owner of part of the island. A lengthy legal hassle, also known as "quarrels of Caprera," was resolved with a judgment of 25 January 1909. By this time Manlio had died so it gave reason to Francesca Armosino and his daughter Clelia, and condemning Ricciotti Garibaldi, the attorneys' fees, for using things that did not own.
At the age of 27, Manlius had a horrible death of tuberculosis. Many historians have stated that the life of Manlio has many points in common with Napoleon II of France: both sons of famous men and valiant general, both died young of tuberculosis, both heirs of ideas, moral and political principles rather heavy to bear.