My maternal 2nd great grandfather Thomas Cassidy was one of three brothers, transported from Ireland to Australia in 1830 on Hercules III, for throwing their landlords horse off Belmore Mountain in Boho, Fermanagh. These projects are aimed at exploring the ancestry of their parents Stephen Cassidy and Catherine Britton.

For more information:

• Click on the links in the pedigree shown above to go directly to each ancestors biography page at Wikitree;
• To view a tree showing up to 254 ancestors, including locations, click here;
• Access a list of Thomas’s ancestral surnames here;
• If you have a subscription, you can also view the tree at Ancestry.

DNA Analysis

• DNA analysis has confirmed that the parents of Thomas are correct;
• Y-DNA testing has identified other family members in Fermanagh who connect on the Cassidy line;
• Autosomal testing has identified other family members in Fermanagh who connect on the Britton line;
• DNA analysis is ongoing to confirm the names of Thomas’ grandparents.

Help connect our Cassidy Clan

• Genemonkey Explains – Making the most of your Cassidy DNA;
• FTDNA – Cassidy Surname Project: both men and women with Cassidy ancestors can join;
• Facebook – The Cassidy Clan DNA Group; I’m the DNA officer for the Clan;
• Facebook – The Official Cassidy Clan;
• Cassidy Clan website.

Help connect our Britton Family

• Genemonkey Explains – How to participate in the Britton DNA projects
• FTDNA – Brittons of Ireland Project: open to anyone with Irish ancestors named Britton (or variants);
• Facebook – The Brittons of Fermanagh Group
• My Britton Family – DNA Triangulated Groups

Other Items of interest

• BBC Interview, 2017
• Cassidy Clan Gathering, 2017 – Blogpost
• Finding your Irish Ancestors, a DNA Journey – Presentation for the Society of Australian Genealogists, 2020
• Finding my Fermanagh family with DNA – Presentation for Cassidy Clan Gathering, 2022

Possible connections via DNA Groups and Clusters

• O’Brien, Annie Agnes c1868 of Iowa – parents from Cavan and Fermanagh