Born in Bayeux, the son of a doctor, Le Cieux found in his father's home the greatest facilities to satisfy a vocation, which had been announced early in his life.
His first violin master was an artist from Bayeux, named Trébutien, who made him begin at the age of thirteen, in one of the concerts of the local philharmonic society.
Received with enthusiasm by his fellow citizens, Le Cieux continued to work with ardour and, in December 1844, he was admitted to the Conservatoire de Paris.
He left the Conservatoire without taking part in the end-of-year competitions and began, from then on, to perform in the concerts and musical soirées in Paris where he acquired a certain vogue despite the inequalities of his talent.
4, Paris (Léon Grus); Fantaisie pour piano et violon sur le Duc d'Olanne, Op.