César Auguste Jean Guillaume Hubert Franck was a French Romantic composer, pianist, organist, and music teacher born in present-day Belgium.
He was born in Liège. He gave his first concerts there in 1834 and studied privately in Paris from 1835, where his teachers included Anton Reicha. After a brief return to Belgium, and a disastrous reception of an early oratorio Ruth, he moved to Paris, where he married and embarked on a career as teacher and organist. He gained a reputation as a formidable musical improviser, and travelled widely within France to demonstrate new instruments built by Aristide Cavaillé-Coll.
In 1859, he became titular organist at the church Sainte-Clotilde, a position he retained for the rest of his life. He became professor at the Paris Conservatoire in 1872; he took French nationality, a requirement of the appointment. After acquiring the professorship, Franck wrote several pieces that have entered the standard classical repertoire, including symphonic, chamber, and keyboard works for pipe organ and piano. As a teacher and composer he had a vast following of composers and other musicians.