Mountshannon House, near Castleconnell in County Limerick, was one of Ireland’s grandest eighteenth-century mansions. Built around 1750, it later gained a monumental Ionic portico during an 1813 remodelling by architect Lewis Wyatt. Tradition claimed the house contained 365 windows, while its vast entrance hall could accommodate a horse-drawn carriage. Surrounded by a 900-acre demesne between the River Shannon and Mulkear River, its celebrated gardens were designed by John Sutherland. Home to the powerful FitzGibbon family, including John “Black Jack” FitzGibbon, 1st Earl of Clare, the mansion became a renowned centre of political influence, hospitality, wealth, political power, and aristocratic life.