My gt gt grandmother was Bridget Cussane 1833 to 1915. There is nothing I can find about her before her marriage to Michael Brennan 1825-1913. They lived in Sessiagh but I am guessing she may have come from a little way away somewhere in or around Claremorris, Co Mayo. I would love to find her baptism or parents.
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Unfortunately, the earliest Bridget Cussane baptismal record for Co. Mayo on the subscription site Roots Ireland was in 1847. If your Bridget was from Claremorris then she was baptized a few years before records are available. Baptismal records for that parish start in March 1835.
The 1855 Griffiths Valuation head of household listing for Kilcolman civil parish shows three Cussaun records https://www.failteromhat.com/griffiths/mayo/kilcolman.htm all living in Meelick More townland. Possibly one of the three was the father of Bridget.
Roger McDonnell