Jackie,
that is a great piece of work! I have something similar too - there are a lot of Cantillons in the area!
My GG Grandfather was Richard, son of Barnabus and Catherine Diggan (that you mentioned, Antocar)
Richard lived in Ballydonoghue, near Listowel.
from your spreadsheet Jackie, Barnanus was a brother of your ancestor.
I remember visiting Ballyheigue Castle as a child, I think it is a hotel now.
TasTyger, I have also come across the names you mentioned.
I had read about Catherine being sent to Van Dieman's land.
I will have a look at my research tonight and see what I have.
Ciarán.