This document analyzes how Shakespeare's play Twelfth Night draws significant inspiration from Giordano Bruno's philosophical work Gli Heroici Furori. It argues that Twelfth Night utilizes many of the key themes, symbols, and plot elements from Gli Heroici Furori, particularly the Actaeon-Diana myth that represents the heroic intellectual journey towards divine truth. The document examines various characters and passages in Twelfth Night that parallel aspects of Bruno's work, such as Orsino representing the heroic lover and Olivia symbolizing divine truth. It posits that Twelfth Night can be read as allegorically representing the transition from a sun-powered economy to one powered by fossil fuels through its characters and their relationships.