James Rochfort (“Prime Iron”) and Thomasine Pigott had several children including Charles who married Marbella, daughter of Theophilus Jones and Alice Ussher, and Robert (1652-1727), who became Speaker of the Irish House of Commons and Chief Baron of the Irish Exchequer. He married Hannah Hancock (d. 1733) of Twyford, County Westmeath.
Robert Rochfort (1652-1727) and Hannah née Hancock had sons George Rochfort (1682-1730), later of Gaulstown, Co. Westmeath and John (1690-1771). George married Elizabeth, daughter of Henry Hamilton-Moore, 3rd Earl of Drogheda. John married, first, Deborah Staunton (d. 1737) then Emilia (d. 1770), daughter of John Eyre (1659-1709) of Eyre Court.
George and Elizabeth née Moore had lots of children. The heir was Robert (1708-1774) who was later created 1st Earl of Belvedere.
Other children included Mary (1705-1729) who married Henry Tuite, 6th Baronet. Alice (1710-1738) married Thomas Loftus (1701-1768). Thomasine, born 1716, married Gustavus Lambart of Beauparc, County Meath (a section 482 property, see my entry). Anne married Henry Lyons, High Sheriff for King’s County. William (1719-1772) married Henrietta Ramsay. Arthur married Sarah Singleton and became MP for County Westmeath. George (1713-1794) married Alice, daughter of Gustavus Hume, 3rd Baronet.
The first Earl of Belvedere is infamous for locking up his wife, Mary Molesworth, daughter of the 3rd Viscount of Swords (see my entry about Belvedere, County Westmeath). Their daughter Jane (d. 1828) married Brinsley Butler, 2nd Earl of Lanesborough. Robert 1st Earl’s son George (1738-1813) succeeded as 2nd Earl of Belvedere.