Genealogy research by Mark Humphrys,
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Oliver Fitzwilliam, 2nd Viscount Fitzwilliam, and 1st Earl of Tyrconnel (see here).
He mar 1stly to Dorothy Brereton
William Brereton, 1st Baron Brereton].
He mar 2ndly to --- Penruddock.
Irish Confederate Wars, 1641 to 1653:
Like his father, he was both Catholic and Royalist.
Loyal to Charles I during English Civil War (the Irish Confederate Wars 1641 to 1653).
He returned to France with his brother as his Lieutenant 1642.
In 1645 he tried to get the Confederation of Kilkenny to support Charles I in the English Civil War, on the grounds that their Catholic demands would be met.
He fought with the Confederates against the Parliamentarians 1645-46.
He fought for Royalists at Battle of Naseby in Northamptonshire in June 1645.
He was Lieutenant-general in 1643-47 period under the 1st Duke of Ormonde (then the 1st Marquess of Ormonde).
He served under his relative, the Irish Confederate leader Thomas Preston, 1st Viscount Tara, in Connaught 1646.
Carried out successful assault on Roscommon Castle, Co.Roscommon in 1646, which secured Connaught for the King.
The Irish Confederates fell out with the English Royalists as it became clear their Catholic demands would not be met. Fitzwilliam stayed loyal to the King and parted with the Confederates.
succ as 2nd Viscount c.1655.
[Down Survey, 1655-58] shows Col. Oliver Fitzwilliam, Irish Papist, as owner of Dundrum and Ballinteer.
He had mixed fortunes under the Parliamentarians. Arrested by them twice, but in favour at other times.
He was in danger of losing his lands, but recovered them at the Restoration.
Attended the influential Rota Club debates run by James Harrington in London 1659-60.
of the monarchy
saw him rewarded for his loyalty.
He was created 1st Earl of Tyrconnel by Charles II 20 Apr 1661 [Complete Peerage], NOT 1663.
He was restored in 1661 to his father's lands, including Baggotrath and Donnybrook.
Took his seat (by proxy) in the Irish House of Lords 1662.
Grant re-affirmed 1666 to him of Dundrum, Merrion, Baggotrath, Donnybrook (the mill only), Simmonscourt, Ringsend, Little Bray, Kilmacud, Thorncastle, Booterstown, and other lands.
On the second storey of Merrion Castle the arms of the family were engraved in stone [Ball, vol.2, 1903].
Attended on his deathbed by Fr. Bernard Doyle, Catholic priest of Booterstown. See [Lyng, 2000].
He died at Merrion Castle, 11 Apr 1667.
Earldom extinct. (Later re-created for Richard Talbot 1685.)
He was bur 12 Apr 1667 in black marble tomb [now vanished], Fitzwilliam chapel, Donnybrook church.
Eleanor buried in St. Mary's Church, Nottingham, 11 April 1681.
Holles St Hospital, Dublin.
Photo 2007. See full size.