Genealogy research by Mark Humphrys,

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My wife's ancestors - Fitzwilliam - Contents

The Viscounts Fitzwilliam of Ireland

This family had many contacts with the family of the Earls Fitzwilliam of England through the centuries. They often referred to each other as kinsmen, and they used similar arms. But there is no real evidence they are related.

Mooretown, just NW of Swords, on 1829 to 1842 map.
The ruin of Glasmore Abbey survives today. See photo and satellite view.

Richard Fitzwilliam,
"of Ballymon" (must be Ballymun, N Co.Dublin),
fl temp Edward II (reigned 1307-27),
had issue:

  1. William Fitzwilliam,
    born est c.1325,
    of Moreton, near Swords, N Co.Dublin.
    This must be Mooretown, just NW of Swords.
    NOT of Swords Castle.
    Ancestor of the Viscounts Fitzwilliam.

Related to the Viscounts Fitzwilliam

Various members of the same Fitzwilliam family were connected with:

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