Commandant Hippolyte Lejosne married Valentin Therese Cazilis-Allut who was Manet's model in Music in the Tuileries. He was a cousin of Jean Frédéric Bazille.
He was an army officer, and a friend of Manet. JW knew him about 1863, or probably earlier.
Grove Dictionary of Art Online, http://www.groveart.com (accessed 2004); http://www.mystudios.com/manet (accessed 2004.04).