He was the son of James Israel Denneny who was a top lacrosse player in the late 19th century and was descended from the Dennenys of County Monaghan, Ireland.
Henry Cairns Westenra, 4th Baron Rossmore of Monaghan (14 November 1851 – 28 March 1874) was an Anglo-Irish soldier and peer who was briefly a member of the House of Lords before his death at the age of 22 in a riding accident.
The area has a strong history of immigration from Ireland, with many travellers settling in the village between 1900 to 1920, particularly from counties Tyrone, Monaghan and Wicklow.
Lord Rossmore died at Rossmore Park, County Monaghan, in August 1842, aged 76, and was succeeded in his titles by his son, Henry.
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Westenra was the son of Henry Westenra, Member of Parliament for County Monaghan, by Harriet Murray, daughter of Colonel John Murray, also Member of Parliament for County Monaghan.
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Westenra was returned to the Irish House of Commons for County Monaghan in August 1800, a seat he held until December of that year, when the Irish Parliament was abolished.
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It was introduced in 1958, and was sold in 250ml bottles in shops in counties Cavan, Monaghan, Sligo, Leitrim, Louth and Meath.
The Clones and Cavan Extension Railway was an extension of the Ulster Railway from Clones in County Monaghan to Cavan opened in 1862.
Another important purchase was ‘The Leslie Conversation Piece’ by J.H. Mortimer, which had previously been at Castle Leslie in Glaslough, a village in the north-east corner of County Monaghan.
Net1 delivers broadband services to homes and businesses using FWA (Fixed Wireless access) from base stations in Louth, Meath, Cavan, Monaghan, Fingal and parts of Armagh, Westmeath, Tyrone, Longford and Fermanagh counties.
Threemilehouse, County Monaghan, Republic of Ireland; called "Cabragh" in the 2006 census.