Mina Lenox-Conynham asserted that a document previously held in the Public Records Office in Dublin asserted that the lands at Ballindrum (later Springhill) were in Conyngham hands as early as 1609, but she believed this record to have been destroyed during the Battle of Dublin and the shelling of the Four Courts[6] It is believed that some form of farm dwelling was constructed on the estate in the second quarter of the seventeenth century (probably on the site of the present carpark) but this was destroyed during the Irish Rebellion of 1641.

Sir William was the last Agent of The Drapers' Company, overseeing their remaining estate in Northern Ireland, which had been extensive and included Draperstown and Moneymore.

Col. William Arbuthnot fought in both the Boer War and World War I and his younger brother Lt. Col. John Staples Molesworth Lenox-Conyngham was killed in action at Guillemont during the Battle of the Somme,[16] on 3 September 1916, personally leading the 6th Battalion Connaught Rangers over the top and into the attack armed only with an ancient revolver.

[17] The two wooden crosses that marked his grave were returned to Ireland and now lie inside St Patrick's Cathedral, Armagh, next to his memorial.

William Lowry Lenox-Conyngham who led the local Home Guard during the Second World War as a result of being invalided out of the National Defence Corps in 1940.

Realising that the finances of the family were now in terminal decline and recognising that neither he nor his brother had any children to carry on the direct line, William Lowry entered into negotiations with the National Trust in 1956 with a view to handing over the house.

This had followed a chance meeting with Nancy, Countess of Enniskillen who had presented Florence Court in County Fermanagh to the Trust the previous year.

William's uncle George Hugh Lenox-Conyngham married Barbara Josephine née Turton whose mother Lady Cecilia was the daughter of Joseph Leeson, 4th Earl of Milltown of Russborough County Wicklow.

They had two sons Denis Hugh and Alwyn Douglas and two daughters Cecilia Laura and Eileen Mary, born in Edinburgh.

Their father had, like previous members of the family, been educated in Edinburgh, in George's case at Fettes College where he was the first former pupil to return as a school master.

[19][20] Following the death of William Lowry in 1957, the head of the family became Captain Alwyn Douglas Lenox-Conyngham RN, his elder brother Denis having died in China in 1928, whilst serving with his regiment The Cameronians.

His eldest son Charles Denis Lenox-Conyngham, former Managing Director of Blue Funnel Line and Chairman of Sealink is the current head of the family.

Upon adopting the property, the National Trust undertook a large-scale programme of restoration and re-construction adopting the orthodoxy of 1950s conservation practice which saw the Victorian smoking room demolished, large portions of the house stripped back to stone and all the rooms re-arranged to reflect their appearance when first constructed.

The Library contains one of the most important collections of 17th and 18th century books in Ireland and is composed of around 3000 volumes, the oldest of which is a small Latin psalter of 1541.

Springhill was used for the location of the three-part adaptation of Eugene McCabe’s modern Irish classic, Death and Nightingales, first broadcast in November 2018, featuring as the home of landowner Billy Winters.