While researching my family tree I've managed to link my 5x Great Grandfather William Masterson (b. ~1770) to the 1803 Dublin Rebellion.
The document (attached) is the Prison Register for Kilmainhan Gaol from 1798 onwards. Entry #66 is Robert Emmet and entry #122 is William!
I notice that William's faith is "sent to the Provost Martial(Marshal) by order of Major ?"
Wiki - "the provost marshal is the head of the military police of each service... In many cases the provost marshal is in charge of discipline."
To me, this would indicate to that William was a member of the British Army running up to the Rebellion and was punished as such.
He wasn't executed and lives for at least another 50 years, so I suppose I would be looking for any more records of his service, discipline and release papers?
I know that records would be scarce for this period but where could I check?
I have checked Fold3 and Ancestry but have found nothing further to this document.