'''Ruggero''' (or '''Ruggiero''')His first name is also spelled "Ruggiero" in many sources. His birth certificate lists his full name as "Ruggiero Giacomo Maria Giuseppe Emmanuele Raffaele Domenico Vincenzo Francesco Donato Leoncavallo". See Dryden (2007) p. 4. However, his tombstone spells his first name as "Ruggero". See [http://www.leoncavallo.ch/documenti.htm Fondazione Ruggero Leoncavallo]. '''Giacomo Maria Giuseppe Emmanuele Raffaele Domenico Vincenzo Francesco Donato Leoncavallo''' (; 23 April 18579 August 1919) was an Italian opera composer. His two-act work ''Pagliacci'' remains one of the most popular works in the repertory, appearing as number 19 on the Operabase list of the most-performed operas worldwide in the 2012/13 season.