Pyrrhus and Demetrius was a 1708 adaptation for the London stage of the 1694 opera Il Pirro e Demetrio by Alessandro Scarlatti with a libretto by Adriano Morselli, first performed at the it:Teatro San Bartolomeo. Pyrrhus and Demetrius was the second most successful opera in early 18th century London, after Camilla. It had 58 or 59 performances between 1708 and 1717. The opera marked the London debut of the castrato Nicolò Grimaldi (Nicolini).