Merri Jean Baptiste Franquin (b. 19 October 1848, Lançon, Bouches-du-Rhône, France, d. 1934) was a French trumpeter, cornetist, and flugelhornist who was professor of trumpet at the Paris Conservatory from 1894 until 1925. Franquin was a teacher of both Georges Mager (1885–1950) who was principal trumpet of the Boston Symphony Orchestra from 1919 until 1950, and Eugene Foveau (1886–1957) who became professor of cornet at the Paris Conservatory in 1925. His collaboration with Romanian composer Georges Enescu (1881–1955) led to the composition in 1906 of Légende, one of the great twentieth-century works for solo trumpet and piano. Franquin's book, Methode Complète de la Trompette Moderne de Cornet a Pistons et de Bugle, has been an influential teaching aid for many trumpet players, notably Maurice André. Franquin's most notable accomplishment while at the Paris Conservatory was his push for the C Trumpet to replace the low F trumpet as a more versatile orchestral instrument. A more modern form of this instrument was introduced to American symphony orchestras by Georges Mager, and it remains very much in popular use in the United States.
Merri Franquin was born 1848 in the small Bouches-du-Rhône town of Lançon in southern France. He was self-taught on cornet for four years before moving to Marseille. There he played cornet in the Marseille Casino Musical and later as soloist at the Palais Lyrique and the Théâtre Chave. In 1870 he became solo flugelhornist with the band of the Marseille Garde National, and in 1872 he was admitted to the Paris Conservatory where he joined the cornet class of the famous cornetist Jean-Baptiste Arban.