1653~1686: Noblemens’ Deaths by Fire Breathing
In 1745, as part of a discussion of the flammable nature of stomach gases, the following details and account were briefly summarized from an earlier book, John Christopher Sturmius' German Ephemerides, anno X, pg. 53. First, there is a brief statement that often "in the Northmost Countries" flames could be seen 'evaporating' (by implication of the text, 'being breathed out') of the stomachs of people who drank strong liquor.
The statement is then followed by this account: about 17 years before Sturmius' book was published, three Noblemen of Curland (whom the author doesn't name "for decency-sake") drank strong liquors, with the result that two of them died from the effect of a flame coming from their stomaches scorching and suffocating them!
John Christopher Sturmius [16?-1703] wrote books between 1670 and 1703; and though some of his texts were published after his death, his death is the latest that something could have been written... thus I estimate the time range for the incident above (if it happened) as 1653~1686 [17 years earlier than he could have written an account]. I have been unable to find this book, which is not much of a surprise... it's old and very rare. Therefore I'm marking this account as 'unreliable' and 'needs investigation.'
'Curland' is the name of a town in the county of Somerset, England; and a list of noblemen from there in the 1600's would be very useful, if anyone has such.