Giulio Cesare Monteverdi (1573–1630/31) was an Italian composer and organist; he was the younger brother of Claudio Monteverdi. Giulio Cesare Monteverdi was born in Cremona where he was baptised on 31 January 1573. In 1600 he held the position of organist of Mantua Cathedral for a brief time. In August 1602 he served as a musician at the court of the Duke of Mantua. On 2 June 1608, during the wedding celebrations at the Mantuan court, he composed the music for the fourth intermedio (words by Chiabrera; music lost), as part of a performance of Guarini's play L'Idropica. In 1609 Francesco Gonzaga (governor of Montferrat at the time) appointed him maestro di cappella. In this position, he wrote his opera Il rapimento di Proserpina (libretto by Ercole Marigliani), on the occasion of the birthd