On a return trip to England, Edmundson was convinced of the truth of Quakerism under the teaching of James Nayler He went back to Ireland and set up a business in Lurgan, County Armagh.
Irish Quakers were known for entrepreneurship, setting up many businesses in Ireland, with many families such as the Goodbodys, Bewleys, Pims, Lambs, Jacobs, Edmundsons, Perrys and Bells were involved in milling, textiles, shipping, imports and exports, food and tobacco production, brewing, iron production and railways industries.
[1] William Penn the founder of Pennsylvania, converted to Quakerism while dealing with his father's estates in Ireland.
Among the famous non-Quakers to go there were Henry Grattan, Cardinal Paul Cullen, James Napper Tandy and Edmund Burke.
The Quakers building on Eustace Street, purchased in 1817, is the former Eagle Tavern, it is where the Dublin Society of the United Irishmen was formed in 1791.
The Cork Street Fever Hospital, Dublin was founded by Quakers in the early 19th century.
The Society was one of the six religious denominations recognised by article 44.1.3 of the Irish Constitution, which was adopted by popular plebiscite in 1937.