It was only through some extreme determination that I managed to discover any more about Joseph Marshall than that he was a farmer, and the father of my GG Grandfather Matthew Marshall.
Scouring newspapers, I finally found a report of his death in the Armagh Guardian of June 24, 1850:
There seem to have been generations of Tyrone Marshalls, all giving their sons the same names, so with neither censuses or parish records, I’m waiting for an old family history to surface somehow! Joseph’s birth circa 1774 makes him the oldest known ancestor I have at that GGG level. He would have been 46 or so when his son Matthew was born, and Matthew in turn was 46 when his daughter Rebecca Rea Marshall, my GG grandmother, was born.