Does anyone have any hints/ tips or clues as to how to pad out Robert and who he was. What he was doing there, and I would guess the Planters records might not be too bad. Can we locate a place for him back in Mainland Britain?
The name Irwin can be found from some of the earliest 'Planter' documents of the early 17C, one of the best early documents for finding out which areas an ancestor may have settled in are the Muster rolls, these contain the names of adult males bearing or capable of bearing arms. From the Muster Rolls of County Londonderry (1630) I can see 11 Irwin's, 4 in the City and Liberities of Coleraine,2 in the N. W. Liberties of Londonderry, 4 in the Barony of Loughinsholin, also1 in the Barony of Keenaght, any or none of these could be a potential ancestor.
This from the Ulster Ancestry website: IRWIN "Origins in Ulster : Scottish Plantaion
Irwin in Ulster is very often confused with Irvine especially in Fermanagh.
This may be due to the fact that both the Irwins and the Irvines arrived in Ulster about the same time (1630) from the same part of Dumfriesshire with both settling in Fermanagh, South Tyrone
The name can sometimes be found as Erwin but this is mainly in Antrim."
So you can see the name had quite a large spread, through various other documents, Hearth Money Rolls, Religious Census records from the 18C, etc. it may be possible to narrow down the area where your ancestors lived prior to the 19C but it would be almost impossible to trace a direct line back to the Plantation as so few documents survive, unless you happened to be related to one of the landed gentry.
Regards
Joe