Etymology The current name 'Blessington' was first recorded in 1667. It may be based on a false etymology that confused the surname with the Irish word , which means blessing.
Ancient and medieval history (2400 BCE - 2000 BCE) found in Blessington and now in the
British Museum The nearby
Rath Turtle Moat was occupied from the 12th century onward by
Norse Gaels and
Normans. Blessington was previously called
Munfine, and in the medieval period was part of the lordship of Threecastles;
Threecastles Castle is a three-storey tower house situated 5 km from Blessington, which was most likely built by
Gerald Fitzgerald,
Lord Deputy of Ireland, or his son Sir James Fitzgerald. The abandoned medieval village of Burgage More is just south of Blessington town. It was an ecclesiastical settlement and is the site of a ruined tower house and church. A granite high cross named
St. Mark's Cross was erected there in the 12th century beside a holy well. The cross was moved from Burgage More to Burgage Cemetery in the 20th century due to the construction of the
Poulaphouca Reservoir and rising water levels.
Early modern history In 1667,
Michael Boyle,
Church of Ireland Archbishop of Dublin and
Lord Chancellor of Ireland, bought the lordship, previously the property of the Cheevers, for £1,000. Archbishop Boyle received a royal charter to establish the town of Blessington, in the townland of Munfine, as a
borough. Construction of
Blessington House was begun in 1673 and afterwards
St Mary's Church on Main Street, which was completed in 1683. On Archbishop Boyle's death in December 1702, his son,
Murrough Boyle, 1st Viscount Blesington, inherited the Blessington estate. Lord Blessington's son,
Charles, 2nd Viscount Blesington, died in June 1732 without an heir, and the estate was inherited by his sister Anne, then her son,
William Stewart, 1st Earl of Blessington. The earl died in August 1769 without an heir and the estate passed to Charles Dunbar, a great-grandson of the 1st Viscount Blessington, who also died heirless in 1778, when the estate passed to
Wills Hill, 1st Earl of Hillsborough, whose seat was
Hillsborough Castle in
Hillsborough,
County Down, a great-great-grandson of Archbishop Boyle. Lord Hillsborough was created as the 1st
Marquess of Downshire in August 1789. The Hills held the estate until 1908. The main road of the town is an example of a planned improvement of towns and villages associated with estates in the late 1700s and early 1800s.
Arthur Hill, the 3rd Marquess of Downshire commissioned a house to be built for his agent . The building later operated as the Downshire Hotel, until its closure in 2005. The Marquess was also responsible for the construction of several prominent buildings in the town such as the Market House (), Downshire Lodge (), and the Parish schoolhouse ().
Russborough House, situated approximately 5 km south of Blessington, was built by the Leeson family,
Earls of Milltown, and became the home of philanthropist
Sir Alfred Beit (1903–1994), before becoming a museum.
20th-century history During the
Irish Civil War, Blessington became a place of strategic importance for the Anti-Treaty forces who regrouped in the town after defeat in Dublin. It was envisioned that they could use the town as a base from which to link up with other Anti-Treaty fighters to launch a new attack on Dublin in July 1922. However, the plan was hampered by lack of coordination and provisions. The Anti-Treaty forces were quickly dispersed following a skirmish with Free State troops. Above the nearby village of
Lacken in the early hours of 18 April 1941, an
RAF Handley Page Hampden aircraft (Registration AD730) got lost in bad weather and
crashed on Black Hill (Kilbeg) killing its entire crew of four. The airmen were brought to Blessington and buried with full military honors on 22 April 1941 at St. Mary's Church by order of the Irish Government.
Modern development Since the turn of the 21st century, Blessington's population has increased substantially, more than doubling from 2,509 at the 2002 census, to 5,010 by the time of the
2011 census. Population reached 5,611 in 2022. == Amenities ==