Julius Carl Fritz Manteuffel (11 January 1875 in Berlin – 21 April 1941 in Berlin) was a German gymnast. He competed at the 1896 Summer Olympics in Athens.Manteuffel was a member of the German team that won two gold medals by placing first in both of the team events, the parallel bars and the horizontal bar. He also competed in the parallel bars, horizontal bar, vault, and pommel horse individual events, though without success.
Jean-Joseph Renaud (16 January 1873 – 7 December 1953) was a French épée and foil fencer. He competed at the 1900 Summer Olympics.He was also a prolific journalist, author and playwright whose books La Défense dans la rue (Self Defence in the Street - 1912) and L'Escrime (Fencing - 1911) are recognised as an important contribution to early 20th century literature on those subjects. He was a proponent of the field of honor, saying: "From every point of view dueling is beneficent." He refereed many duels (including ones involving Clemenceau and Leon Blum) and fought at least 15 himself (being a fencing master, all but 4 were fought with pistols; he was victorious in all of them).