Thomas Fitzwilliam, 4th Viscount Fitzwilliam 
 
  
   4th Viscount, 1700. 
  Used here with the kind permission of the
Fitzwilliam Museum, Cambridge.
Thomas Fitzwilliam, 4th Viscount Fitzwilliam,
born est c.1645.
 
See 
wikipedia
and 
genealogics.
He stayed Catholic.
He  succ as 4th Viscount apparently  1675.
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:
 
-  (dau) Fitzwilliam.
She mar her 1st cousin
Stephen Fitzwilliam Browne.
 -    Richard Fitzwilliam, 5th Viscount Fitzwilliam, 
 
born c.1677.
He is 
described  as "about   17 years old in 1694". 
 [PP, vol.1, family tree] 
has him as born 1679.
 
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].
He 
 died 20 Feb 1704, age est c.60 yrs.
 
Will pr Apr 1705.
 
Elizabeth  may be   "The Lady FitzWilliam" who  died 4 Feb  1717.
4th Viscount 
  had issue by 2nd wife:
 
-  Mary Fitzwilliam, 
mar    George Talbot 
[grandson of
John Talbot, 10th Earl of Shrewsbury], 
 had issue:
- George Talbot, 14th Earl of Shrewsbury.
 
 
 
 
   Mary Stapleton, 1679.
  Used here with the kind permission of the
Fitzwilliam Museum, Cambridge.
 
 
[Wilkinson, 1925] 
said a  portrait of Mary Stapleton  
"hung for many years in the diningroom at Mount Merrion".
This would   be a different  picture since this one
 was given to Cambridge in 1816.

 

 
4th Viscount in 
 	[Complete Peerage].