Looking for John O Brien Brien Brian from County Wexford Ireland

He was born in County Wexford, Ireland in 1803. He is buried in Topsail, Newfoundland Canada. This information is stated on his headstone. His wife was Mary, maybe, O'Donnell. Don't know if they were married in Ireland or Newfoundland. No siblings or parents in this area with him. He was listed in cenus in Topsail in 1833 he died in 1875.