William Fitzwilliam, 3rd Viscount Fitzwilliam,
mar Mary Luttrell
[born est c.1620,
descendant of Edward I].
The Fitzwilliams had left Dundrum Castle by 1653, and did not live there again.
After the Restoration 1660 he lived at Simmonscourt Castle.
He succ his brother as 3rd Viscount 1667.
Mary died pre-1673
[Complete Peerage] says 3rd Viscount died pre-1673.
Though [Ball, vol.2, 1903] says he died 1675, attended by a Catholic priest, in the parish of St.Nicholas Within, Dublin.
He was bur Donnybrook church.
3rd Viscount and Mary had issue:
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