Possible Clues:

• Catastrophic event
• Place a posy, put out for the unveiling
• End of the world
• Now it is a reworking of a 5 work
• Violent event represented in old space play
• The end of the world means papacy lose ground
• Revelation set back work in awful place, say
• The White Horseman exhibited a new one
• Revelation in a topical piece shortly penned by poet
• Now in the cinema: it features horsemen