The Pantheon Opera remains among the least known of the major theatrical ventures in eighteenth-century London. It came into being amidst the conspiracies that flourished after the King's Theatre, Haymarket, was destroyed by fire in June 1789. Conceived as a kind of English Court Opera, the Pantheon was backed at enormous expense by the Duke of Bedford and the Marquis of Salisbury. It struggled through the 1790–91 season, accumulating ruinous debts, and then on 14 January 1792 it too burned to the ground, just four nights into its second season.