Genealogy research by Mark Humphrys,
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Thomas Fitzwilliam, 1st Viscount Fitzwilliam (see here and here),
Royalist in Irish Confederate Wars 1641 to 1653:
He was loyal to Charles I during English Civil War (the Irish Confederate Wars 1641 to 1653).
Loyal to the crown in rebellion of 1641.
Merrion Castle and Baggotrath were garrisoned with soldiers to defend Dublin.
The government forces leader Simon Harcourt, who was mortally wounded by a sniper on 26 Mar 1642 while fighting the rebels at Carrickmines Castle, Co.Dublin, was taken to Merrion Castle where he died on 27 March 1642.
Merrion Castle was overrun by the rebels in June 1642.
He was cr Earl of Warrington by Charles I in 1645, but it was not upheld. This letters patent is in Wilton House.
Merrion Castle was taken and was garrisoned by the Parliamentarians as at 1648.
Baggotrath Castle was destroyed 1649 in the Royalist-Parliamentarian fighting leading to the Battle of Rathmines of 2 August 1649. 1st Duke of Ormonde and 1st Earl of Inchiquin were Royalist commanders.
The Royalist defeat at Baggotrath and Rathmines was a crucial point in the end to resistance to Cromwell in Ireland. See [Ball, vol.2, 1903].
Cromwellian conquest of Ireland complete 1653.
1st Viscount was outlawed in Ireland under the Parliamentarians. He did not live to see the Restoration.
[Down Survey, 1655-58]
shows Lord Fitzwilliam of Merrion, Irish Papist,
as owner of
This refers to him rather than his son
since his son is referred to as Col. Oliver Fitzwilliam.
He died c.1655, age c.74 yrs.
1st Viscount and Margaret had issue:
Dublin city officials ride in procession around the bounds of the city in 1603.
They rode to Merrion chapel.
They then came to the grounds of Merrion Castle. They arrived at "the south-west corner of the orchard ditch of Merrion, through which corner the elder [fathers] of the city said that of old time they did ride. And now for that the same was so strongly fenced with trees and thorns, which, in favour of the gentleman of the house of Merrion [Thomas Fitzwilliam], being the city tenant, they would loathly break down, they rode a little besides it".
Copy of Speed's 1610 map that appears as an insert on John Rocque's map of Dublin, 1757.
This map is an insert in Dublin Bay on Rocque's map.
Confusingly, he overlays it with the depth figures he notes for the water, which all have a dot after them.