The Irish Quaker community is today very small but at the turn of the 19th century, they were a large, active mobile community in Ireland, with strong links to Pennsylvania, which was founded by William Penn, an English Quaker. They also kept amazingly detailed records in both the personal and business spheres. This lecture traces the history and impact of Irish Quakers and showcases their records while considering what a largescale DNA project might uncover for this endogamous and distinct community within Ireland.