Ottavio Rinuccini (20 January 1562 – 28 March 1621) was a prominent Italian poet, courtier, and opera librettist, notable for his contributions at the transition from the Renaissance to the Baroque era. Born into a noble family in Florence, Rinuccini became an influential figure in the development of opera. He is recognized as the first opera librettist, having collaborated with composer Jacopo Peri on the production of "Dafne" in 1597, which is considered the first opera. Rinuccini also wrote the libretto for "Euridice," which was set to music by both Peri and Giulio Caccini, and was performed in 1600 for the nuptials of Mary of Medicis. Additionally, he penned the libretto for Claudio Monteverdi's "L'Arianna" and "Il ballo delle ingrate," both first performed in 1608. His works were celebrated for their lyrical quality and were instrumental in the evolution of musical drama. Rinuccini's poetry was set to music by various composers, and his contributions were published posthumously by his son. He died in Florence, leaving a lasting legacy in the world of opera.