Two Sussex cities have teamed up with other historic towns in the south to sell themselves abroad.
Brighton and Hove and Chichester have linked with Canterbury, Guildford, Salisbury, Royal Tunbridge Wells and Winchester for the project.
They have already been developing common themes of architecture, archaeology, cathedrals, arts and festivals, speciality shopping and royal connections to form helpful touring itineraries.
These will feature alongside a tailor-made itinerary service for trade and consumer users on the partnership's website.
Promotional campaigns are being launched in America, Ireland and France, the three main markets identified so far through industry consultation.
Melanie Sensicle, marketing manager for Brighton and Hove, who heads the partnership, said: "Working on our own, we simply do not have adequate resources of money or time to develop sustained campaigns overseas.
"By working as an historic city team, we can pool resources and expertise to make more impact."
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