Auguste Chapdelaine, a French Catholic missionary, is executed for preaching Christianity in the interior of the Empire of China.
Postscript: Soon thereafter the Empire of France used this as a provocation to join the Second Opium war on the side of the United Kingdom, against China.
[added 9/26/2026]
Subsequent Events:
References:
Second Opium War – Wikipedia
en.wikipedia.org/wiki/Second_Opium_War
Auguste Chapdelaine – Wikipedia
en.wikipedia.org/wiki/Auguste_Chapdelaine