Ber·li·oz 
(bĕrlē-ōz′, -ōs′), (Louis) Hector 1803-1869.
(bĕrlē-ōz′, -ōs′), (Louis) Hector 1803-1869. French composer and leading representative of romanticism in French music. His works include Symphonie fantastique (1830), Romeo and Juliet (1839), and the opera The Trojans (1858).