The Earl of Wessex has become the new Royal Patron of the Hall for Cornwall in Truro.
The theatre attracts about 180,000 people a year
Prince Edward's appointment follows his attendance at the venue's 10th anniversary gala last October.
The prince, the youngest child of the Queen and Duke of Edinburgh, works with a number of charities, particularly the arts, sport and young people.
The venue is used for a wide variety of shows and attracts about 180,000 theatre and concert-goers a year.
Hall Director Tim Brinkman said: "We are absolutely delighted that the Earl of Wessex has agreed to be our patron.
"His support of the arts is well known and I can think of no-one better to be our patron."