Thomas Fitzwilliam, 4th Viscount Fitzwilliam,
He mar 1stly to Mary Stapleton
[born pre-1636,
descendant of Edward III].
In 1686 the
old Catholic church at Booterstown
was constructed,
almost certainly under the 4th Viscount's protection.
He supported King James
in the
Williamite-Jacobite War 1689-1691.
[Complete Peerage]
says he was outlawed 7 May 1689 but shortly after restored.
He
fought with the Jacobite army
at the Siege of Limerick 1691,
at which the Jacobite cause
was finally defeated.
[Mount Merrion 300]
says that
his name is mentioned in the
Treaty of Limerick,
and
he was one of twelve Catholic Peers who were allowed to retain their lands.
Though he does not appear in
this text of the Treaty.
Still owner of the mill of Donnybrook.
He
could not take his seat in the
Irish House of Lords
in 1695
because he would not renounce the Catholic faith.
Mary died pre-1699.
4th Viscount
had issue by 1st wife:
4th Viscount
mar 2ndly, shortly before 7 Oct 1699, to Elizabeth Pitt [dau of George Pitt].
She was
apparently
relation of
George Pitt, 1st Baron Rivers.
4th Viscount apparently spent time living in England, and
Merrion Castle
fell into disrepair
[Mount Merrion 300].
His will
dated 24 Apr 1704.
The will notes his son
Richard is now married.
In his will he appoints Honora Belasyse,
widow of George Neville, 12th Baron Abergavenny,
as guardian of his dau Mary.
Her niece had recently married his son.
He
died Feb 1705 (new style year), age est c.60 yrs.
Dating this is tricky:



4th Viscount in
[Complete Peerage].
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