Viscount Fitzwilliam of Mount Merrion House in Dublin is in Viscount Ireland.
In 1629 Thomas Fitzwilliam 1st Viscount Fitzwilliam [aged 48] was created 1st Viscount Fitzwilliam of Mount Merrion House in Dublin.
In 1650 Thomas Fitzwilliam 1st Viscount Fitzwilliam [aged 69] died. His son Oliver [aged 40] succeeded 2nd Viscount Fitzwilliam of Mount Merrion House in Dublin. Eleanore Holles Countess Tyrconnel by marriage Viscountess Fitzwilliam of Mount Merrion House in Dublin.
On 11th April 1667 Oliver Fitzwilliam 1st Earl Tyrconnel [aged 57] died without issue at Merrion Castle, Mount Merrion, Dublin. Earl Tyrconnel extinct. His brother William [aged 57] succeeded 3rd Viscount Fitzwilliam of Mount Merrion House in Dublin.
In 1670 William Fitzwilliam 3rd Viscount Fitzwilliam [aged 60] died. His son Thomas [aged 30] succeeded 4th Viscount Fitzwilliam of Mount Merrion House in Dublin.
In 1704 Thomas Fitzwilliam 4th Viscount Fitzwilliam [aged 64] died. His son Richard [aged 27] succeeded 5th Viscount Fitzwilliam of Mount Merrion House in Dublin. Frances Shelley Viscountess Fitzwilliam [aged 18] by marriage Viscountess Fitzwilliam of Mount Merrion House in Dublin.
On 6th June 1743 Richard Fitzwilliam 5th Viscount Fitzwilliam [aged 66] died. His son Richard [aged 31] succeeded 6th Viscount Fitzwilliam of Mount Merrion House in Dublin.
On 25th May 1776 Richard Fitzwilliam 6th Viscount Fitzwilliam [aged 64] died. His son Richard [aged 30] succeeded 7th Viscount Fitzwilliam of Mount Merrion House in Dublin.
On 4th February 1816 Richard Fitzwilliam 7th Viscount Fitzwilliam [aged 70] died unmarried. He was buried at St Mary Magdalene Church, Richmond [Map]. His brother John [aged 63] succeeded 8th Viscount Fitzwilliam of Mount Merrion House in Dublin.
In 1830 John Fitzwilliam 8th Viscount Fitzwilliam [aged 77] died. His brother Thomas [aged 74] succeeded 8th Viscount Fitzwilliam of Mount Merrion House in Dublin.
In January 1833 Thomas Fitzwilliam 9th Viscount Fitzwilliam [aged 77] died. Viscount Fitzwilliam of Mount Merrion House in Dublin extinct.