Looking for Conno Y Family IN Strongfort Craughwell CO Galway Ireland

I am researching my family tree and have been told that my family go back about 400 years in the same house and location. I can go back to my great great grandfather Denis Connolly. From an inscription on family headstone I know he was born in 1780. And that his wife's 1st name was Mary but I dont know her maiden name.
I would like to know where I can go to find out more about these people and their families.
I know that they probably got married circa 1830 and they had 4-5 children. One of these children was my great grandfather Michael Connolly.