In 1893, when he was eighteen, Monteux married a fellow student, the pianist Victoria Barrière. With her he played the complete Beethoven violin sonatas in public. Neither family approved of the marriage; although the Monteux family were not religious, both they and the Roman Catholic Barrières were doubtful about an inter-religious marriage; furthermore, both families thought the couple too young to marry. There were a son and a daughter from the union.
