The Immortal Hour - Rutland Boughton?s music drama adapted from the play by Fiona Macleod. (Glastonbury, 28th June 1914). First produced Old Vic, 31st May 1920 and Regent Theatre, 13th October 1922. This image is for the revival at the Regent Theatre 14th November 1923. The Times' theatre critic found it easier to praise the costumes than to explain what the story, from Celtic mythology, was about.