The Mansfield family has a fortune of anything between €400m and €1.6bn.
Jim Mansfield Snr, the head of the family, is the owner of the Citywest hotel, conference and golf complex, and is one of Ireland's most colourful businessmen.
Along with the vast Citywest complex, the Mansfields own Palmerstown House in County Kildare -- formerly the PGA National.
Jim Snr (70) has built his success largely on the massive growth of Citywest, which has enabled him to fund the development and expansion of his other interests, including the Weston Executive Airport.
Towards the height of the boom, Mr Mansfield's wealth was estimated at €383.9m in a rich list compiled by Estates Gazette in Britain.
But in an interview some four years ago, he claimed his business assets had a combined value of €1.6bn.
The Gazette's valuation was based largely on his ownership of 164 acres of land at Citywest.
But his total land bank at the time was believed to have been closer to 2,200 acres, including about 1,000 acres that have been rezoned for housing.
The value of these tracts would have fallen dramatically in the meantime.
As well as the four-star Citywest Hotel and Weston Airport, Mr Mansfield owns Finnstown Country House Hotel in Dublin.
He is part of a consortium, which, in partnership with the Railway Procurement Agency, is extending the Luas line from Belgard through to Saggart.
One of his three sons, Tony, runs the family's plant hire business, HSS.
Another son, PJ, is a pilot and is married to former Miss Ireland Andrea Roche.
The middle son, Jimmy (42), works for his father in his hotel and property empire.
Shortly after the death of model Katy French, Jimmy emerged as the mystery man who had been in an "on-off" relationship with her 10 months after her split from boyfriend Marcus Sweeney.
Citywest is an impressive complex, with 1,400 hotel bedrooms, a banqueting capacity of 2,000 and a massive conference facility.
But there is now strong competition from the new convention centre at Spencer Dock in the city centre.
Mr Mansfield said in 2008 that descriptions of himself as "the rogue of the property industry" were unfair.
"I never built a house without planning permission," he said. "I have never been fined.
"There were two enforcement notices taken against me, which were filed in Tallaght. We appealed them to the Circuit Court and they were taken out straight away."
Born in Brittas, Co Wicklow, Mr Mansfield's first job was on a farm.
In 1990, he bought the Saggart property that is now the Citywest hotel.