Hi Anonymous - In answer to your question about St Martin's Well:
A book by Terry Faull, 'Secrets of the Hidden Source', lists most wells in Devon and this is what he says:
St Martin's Well: located at the edge of Cathedral Close; this was claimed to be a Roman Well (possibly located in the cellars of the Royal Clarence Hotel)."
If you live locally try asking at the Hotel, or else pop in to the Royal Albert Memorial Museum in Queen Street. There's a good Roman period display there.
Or check out the Exeter city website.
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