History Of Impressionism
After the death of his father in 1862, Manet married Suzanne Leenhoff in 1863. Leenhoff was a Dutch-born piano teacher of Manet's age with whom he had been romantically involved for approximately ten years. Leenhoff initially had been employed by Manet's father, Auguste, to teach Manet and his younger brother piano. She also may have been Auguste's mistress. In 1852, Leenhoff gave birth, out of wedlock, to a son, Leon Koella Leenhoff.
Eleven-year-old Leon Leenhoff, whose father may have been either of the Manets, posed often for Manet. Most famously, he is the subject of the Boy Carrying a Sword of 1861 (Metropolitan Museum of Art, New York). He also appears as the boy carrying a tray in the background of The Balcony.