Edgeworth Lysaght, later Edward Anthony Edgeworth Lysaght, and from 1920 Edward MacLysaght (Irish: Éamonn Mac Giolla Iasachta), a genealogist of twentieth century Ireland, is born on November 6, 1887, at Flax Bourton, Somerset, England. His numerous books on Irish surnames build upon the work of Rev. Patrick Woulfe’s Irish Names and Surnames (1923).

Lysaght is born to Sidney Royse Lysaght (1856-1941), of Irish origin, a director of the family iron and steel firm John Lysaght and Co. and a writer of novels and poetry, and Katherine (died 1953), daughter of Joseph Clarke, of Waddington, Lincolnshire. His grandfather, Thomas Royse Lysaght, is an architect, and his great-grandfather, William Lysaght, a small landowner distantly connected with the Barons Lisle. He is named “Edgeworth Lysaght” after his father’s friend, the economist Francis Ysidro Edgeworth. He loses the sight in one eye after a childhood accident.

Lysaght is educated at Nash House preparatory school, Bristol, and Rugby School at Rugby, Warwickshire, where he is unhappy, his parents’ frequent absence due to his father’s business responsibilities necessitating travel to South America, South Africa, and Australia contributing to this. He is a contemporary there of Rupert Brooke, whose father is Lysaght’s housemaster. Eighteen months after leaving Rugby, on the advice of Francis Edgeworth, he goes to Corpus Christi College, Oxford, to study law, but, having on his own account “had a wild time as part of the smart set” and anticipating rustication after a drunken incident, he leaves after three terms.

Lysaght takes up residence in a caravan at Lahinch, County Clare, where he had previously holidayed and become friendly with local people. His father, himself strongly connected to his Irish boyhood and wanting to establish himself as a “country gentleman,” recognizes his son’s enthusiasm for Ireland and in 1909 purchases a 600-acre estate at Tuamgraney, at which Lysaght farms until 1913, introducing an electrical generator and other forms of modernization including the development of a lime kiln, nursery, and school where young men of means can learn the basics of farming. This is the beginning of a metamorphosis for him. Although of English upbringing, he dislikes the local gentry, considering them “layabout rentiers,” and prefers to make friendships amongst employees and his neighbours. He seeks to replace his English accent with a Clare accent, eschews his lack of religion of a few years before in favour of Roman Catholicism, and becomes involved in the Gaelic League.

An integral factor in Lysaght’s reinvention is his relationship with Mabel (“Maureen”) Pattison. Five years his senior, they meet when he spends a period at a Dublin hospital. She is born and raised in South Africa, her father a civil servant there, but has Irish family including a local postmistress. His family seeks to avoid what they consider an unsuitable marriage, sending him and his brother Patrick on a world tour, but the couple are nevertheless married at the Brompton Oratory on September 4, 1913. Mabel introduces him to friends in the Arts Club, and he enters Dublin literary society. His father invests £300 in Maunsell’s publishers, who produces Lysaght’s book of poems, Irish Eclogues. As of the early 1930s, he serves on the General Committee of the Munster Agricultural Society.

By 1915, Lysaght’s command of the Irish language has improved dramatically, and in that year he founds the Nua-Ghaeltacht at Raheen, County Clare. He is an independent delegate to the 1917-18 Irish Convention in which he opposes John Redmond‘s compromise on Home Rule. By 1918 his involvement in all aspects of the Irish independence movement have deepened greatly. Although not known if he is actually a member of the Irish Republican Army (IRA), he is very active in the Irish War of Independence as a supporter, financially and otherwise, of the East Clare Brigade of the IRA and its legendary leaders, Michael and Conn Brennan.

In 1920, Lysaght, along with others of the name, changes his name to “MacLysaght,” “so as to emphasise its Gaelic origin.”

MacLysaght’s Raheen office serves as a meeting place for the Volunteers and guns, documents and ammunition are stored there. However, the war leads to a sharp decline in the fortunes of his farm. The execution of close friends such as Conor Clune of Quin in November 1920 and the subsequent devastating raids on his farm result in his playing a far more active role in Sinn Féin as a loyal supporter of the new TD for Clare, Éamon de Valera. For this he is imprisoned following his return from Britain as part of a Sinn Féin delegation which is publicising the Black and Tans atrocities.

MacLysaght is elected to the Free State Seanad Éireann in 1922. He is appointed Inspector for the Irish Manuscripts Commission in 1938. He is elected to the Royal Irish Academy in 1942 and in the same year is awarded a Doctor of Letters (D.Litt). He is appointed Chief Herald of Ireland in 1943 and serves in this post until 1954. He serves as Keeper of Manuscripts at the National Library of Ireland from 1948 to 1954 and is Chairman of the Irish Manuscripts Commission from 1956 to 1973.

MacLysaght dies at the age of 98 on March 4, 1986, and is interred in the graveyard of St. Cronan’s Church, Tuamgraney.