Thank you for your reply gaffy
I have a Mary Tobin on the 1871 census for Clerkenwell, London & it says she was born at Glannert, Ireland abt 1804
It has been suggested that this may be a misspelling of Glanvert or Clanvert.
I know she was married in Ireland to a Edward Tobin but have no date or place. Trying to narrow down my options.