Professor John Pentland Mahaffy
Back in 1865 Mahaffy married Frances Letitia, daughter of William MacDougall who lived in Drumleck House in Howth. Once married they moved to Dublin city. Mahaffy studied the meteorological records of the time and concluded that Howth had the highest average hours of sunshine of any point in Ireland, and very soon rented a summer residence called Sealawn on the Sutton side of the Howth Peninsula.
Mahaffy was tutor to Oscar Wilde, who described Mahaffy as his "first and greatest teacher". Oscar used to visit Mahaffy when he lived in Sealawn in Sutton. In 1876 Wilde wrote to William Ward "I am with that dear old Mahaffy every day. He has a charming house by the sea here, on a place called the Hill of Howth, one of the crescent horns that shuts in the Bay of Dublin, the only place near town with fields of yellow gorse and stretches of wild myrtle, red heather and ferns...” 
According to the book on Mahaffy by Stanford and McDowell, the story at the time was that his wife, Frances, bought Earlscliffe for Mahaffy from spare cash saved from her housekeeping money! How true this is, nobody knows, but certainly Mahaffy would have been well paid at Trinity and would have earned royalties in Britain and America from the many books he had published.
It has also been said that Mahaffy had a reputation as 'an out-and-out snob'. For instance it was noted that Mahaffy loved the nobility and would prefer the company of dukes and kings. When he moved into Earlscliffe as his second major residence, a wag at the time suggested that maybe it had better be renamed Dukescliffe! 
Mahaffy only used Earlscliffe as a summer residence, spending the rest of the year at his property at 38 North Great George's Street in the centre of Dublin. The 1911 Census of Ireland was taken in April that year and does not mention Mahaffy living in any property in Howth. However, we believe that the house named as "house number 1 in Censure (Howth, Dublin)" refers to Earlscliffe as Mahaffy is named as the landlord. The only occupants listed in the census were Thomas Meharry (the gardener) and his family. 
Mahaffy loved his life in Ireland and always wanted to be provost of Trinity College Dublin, but had to wait until 1914 when he was seventy-five to gain the title. A few years later in 1918 he received the Knight Grand Cross of the Order of the British Empire, which was thought to be unusual as tradition was that a man in holy orders (he had been ordained as a clergyman) could not become a knight. However, he wasn't Sir John for long as he died on the 17th April 1919. 
Mahaffy had two daughters, Rachel Mary and Elsie, and two sons, Arthur William and Robert Pentland.
Rachel, the youngest daughter, was born around 1874. She loved botany and had a great knowledge of plants.  She contributed to the "Irish Naturalist" with sightings of rare plants spotted in and around the Earlscliffe estate.  She was also a good friend of the dramatist, George Bernard Shaw, who wrote to her and her father during the time they lived at Earlscliffe and North Great George's Street  , and afterwards when she lived in Sandymount in Dublin.  Rachel, who never married, was also a great supporter of her father, especially after her mother (Frances) died in 1908.  Rachel died on the 18 Jan 1944. 
In contrast to Rachel, Mahaffy apparently found his eldest daughter Elsie to be rather difficult.  She did, however, write a good account of the events in Trinity College during the rising of 1916. Her diary on this can still be found in Trinity College archives.  She, too, never married and died in November 1926. 
John Pentland Mahaffy was a well travelled man, spending long periods in Greece, Africa and a number of trips to America. On his trips to Greece Mahaffy discovered two snowdrop species and named them after his daughters. The first found on Mount Hymettus he named Galanthus Rachelae and the second found on Mount Athos he named Galanthus Elwesii. 
The eldest Mahaffy son was Arthur William who was born in Howth on 22 Oct 1869. He was educated at Trinity College Dublin and at Oxford where he was a distinguished oarsman and went into the army.  In 1910 he was assistant to the high commissioner for the Western Pacific Islands  and rose to being the administrator of Dominica.   He died in October 1919 
The youngest Mahaffy son was Robert Pentland. He was born in 1871  and graduated at Cambridge in 1893. He was called to the Bar in 1901 and was a barrister in London for some time.  In 1902 it was reported in the New York Times that he was engaged to Miss Beatrix Jones from the US.  However, we know that Robert never married Miss Jones as in 1904 he sailed from Liverpool to Ellis Island, New York with his father and it was recorded on the ships manifest that he was single.  He eventually married Hon. Evelina Victoria Dillon, daughter of Hon. Conrad Adderly Dillon and Ellen Lousia Dashwood, on 6 May 1919. 
In the first world war Robert Mahaffy served with The Devonshire Regiment and in the Egyptian Army and in 1920 was promoted major of The Royal Fusiliers (T.A.). He died on the 8th May 1943. 
Earlscliffe after John Pentland Mahaffy's death
After Mahaffy died on the 4th June 1919 , the house remained with the Mahaffy family for a few years more. The lease of Earlscliffe was renewed in 1922 with Howth Castle Estates for a period of 250 years by his daughter Rachel Mahaffy. 
Rachel Mahaffy finally sold the house in 1922 to the Very Rev. Charles Thomas Ovenden, the Dean of St. Patrick's Cathedral in Dublin. 
As Earlscliffe was primarily used as a summer residence, at the time of the 1911 census (2nd April 1911), the only residents at Earlscliffe were the Meharry family, consisting of:
- Thomas Meharry (Husband), 33 years old, Gardener (Domestic), from Co. Cavan
- Margaret Meharry (Wife), 29 years old from Co. Meath
- Martha Jane Meharry (daughter), 3 years old, born in Dublin
- David T Meharry (son), 1 years old, born in Dublin
- Thomas Meharry (son), 8 months, born in Dublin
In the 1911 census, Earlscliffe was the first house listed on the form for Censure and was occupied by the Meharry family, with the Gardener's cottage being listed as unoccupied. 
Scrollable timeline covering related events
The following link displays a scrollable timeline related to John Randal Plunkett, showing births, marriages, deaths and major events in their lives and in their home and working environments.
List of Earlscliffe Residents
-  A History of the County Dublin, Francis Elrington Ball, originally published in six volumes (1902-1920). Volume 5 "Howth & its Owners" , Chapter 9 "As a Packet Station and After" https://archive.org/details/historyofcountyd05ball
-  Howth Through The Eye of the Artist, Vincent McBrierty, Publisher Trinity College Dublin Press, (2005), ISBN 1871408407
-  The Howth peninsula: Its history, lore & legend, Vincent J McBrierty, Publisher: North Dublin Round Table (1981) ISBN: 0950755303
-  John Pentland Mahaffy: Biography of an Anglo-Irishman, W B Stanford and R B McDowell, Publisher: Routledge & Kegan Paul Ltd, 1971, ISBN 0 7100 6880 8
-  The National Archives of Ireland, Census of Ireland 1911, http://www.census.nationalarchives.ie/pages/1911/Dublin/Howth/Censure/20121/
-  "Mahaffy Descendants", Compiled by Estelle Kinports Davis and Mary E. Mahaffey Carst, HARRISBURG, PENNSYLVANIA, published in 1914, pp 144-167, as seen here: http://freepages.genealogy.rootsweb.ancestry.com/~bbunce77/Mahaffey8.html
-  Title deeds and other legal documents that are currently in the possession of Karen Foley
-  Irish Times obituary for Miss Rachel Mahaffy, January 21, 1944 pg 3
-  The Irish Naturalist was an important scientific journal that was first published in April 1892. Rachel Mahaffy identified a number of plants that were native to Howth and were not included in the standard book on the subject, "Flora of Howth", by H. C. Hart, B. A., F.L.S. Dublin: published by Hodges, Figgis, and Co., 1887. See http://www.archive.org/stream/irishnaturalist04roya/irishnaturalist04roya_djvu.txt
-  As referenced in "A Bernard Shaw chronology" by Anthony Matthews Gibbs Published by Palgrave Macmillan, 2001 ISBN 0312231636, 9780312231637, pg 227
-  As referenced in "Shaw: The Annual of Bernard Shaw Studies" by Fred D. Crawford Published by Penn State Press, 1998 ISBN 0271017791, 9780271017792, pg 9
-  As reported in the Irish Times "The Garden" section May 10, 1919 pg 5 and pointed out to me by Peter Boyle, Fellow emeritus, TCD. As there are a large number of snowdrops in the grounds of Earlscliffe, we are currently looking out to see if these varieties can be found in the garden.
-  As referred to in http://www.tcd.ie/Library/manuscripts/collections/rebellions.php
-  See http://www.archive.org/stream/oxfordmen188018900fostuoft/oxfordmen188018900fostuoft_djvu.txt
-  See http://www.trussel.com/kir/gilbibm.htm
-  See http://www.worldstatesmen.org/Dominica.html and http://rulers.org/ruld.html
-  New York Times, Aug 31, 1902 http://query.nytimes.com/mem/archive-free/pdf?_r=1&res=9901E1DC153DE433A25752C3A96E9C946397D6CF The full transcript is as follows: "From abroad comes the report of the engagement, which cannot now be verified, as Mrs. Jones and her daughter are abroad, of Miss Beatrix Jones, daughter of Mrs. Cadwallader Jones, and Robert Mahaffy, a son of John Pentland Mahaffy of Trinity College Dublin, Ireland. J. P. Mahaffy is well known as an author of various educational and other works, and is a member of many English and foreign societies. Miss Jones is a granddaughter of the late William Rawle of Philadelphia. Mrs Jones and her daughter sailed for Europe in June."
-  The manifest for the ship S.S. Arabic that arrived at Ellis Island from Liverpool on August 21 1904, can be found here: https://www.libertyellisfoundation.org Mahaffy and his son Robert travelled together to go to the Congress of Arts and Science at St. Louis. Mahaffy paid for his sons trip. This was Robert's first time in the U.S., but Mahaffy had been there before (New York 1889)
-  http://www.thepeerage.com/p3771.htm
-  As reported in the London Times on the 10th May 1943, and quoted here: http://www.geneagraphie.com/getperson.php?personID=I188862&tree=1 Please note that the London Times obituary states that he was born in 1871. However, on the manifest for the ship S.S. Arabic quoted above for a journey taken in August 21, 1904 he is stated as being 36 years old.
-  Irish Times obituary for Miss Elizabeth Mahaffy, November 6, 1926, pg 7
-  Irish Times obituary for Mr Arthur W. Mahaffy O.B.E., October 20, 1919, pg 5
-  See http://www.willcalendars.nationalarchives.ie/search/cwa/details.jsp?id=1700517868
-  As taken from the Census of Ireland, 1901 http://www.census.nationalarchives.ie/pages/1911/Dublin/Howth/Censure/20121/
This page was last updated on 20-Dec-2020 .