It was a jewel in the pub portfolio crown of Sean Quinn who was once a billionaire and Ireland’s richest man. Now the Mahon family, the owners of the famous Pig ‘N’ Whistle chain of pubs in New York, have pipped Conor McGregor, the MMA star, to acquire the well-known JW Sweetman pub on Burgh Quay, a four-storey venue overlooking the river Liffey. The Mahon family are believed to have offered €5.5 million for the pub which was put on the market by estate agent John Hughes of CBRE. The pub was previously owned by the family of Sean Quinn but they lost control…