Genealogy research by Mark Humphrys,

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My wife's ancestors - Fitzwilliam - Contents


There are descents from two families here, the Viscounts Fitzwilliam of Ireland and the Earls Fitzwilliam of England.
There is no real evidence that the two families share a common origin - though there were many contacts between the two families through the centuries, they often referred to each other as kinsmen, and they used similar arms.

The Viscounts Fitzwilliam of Ireland

Various members of the Fitzwilliam family not shown below were connected with:

We start our line with:

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, W of Swords (see 1887 to 1913 map),
    NOT of Swords Castle.

Glasmore Abbey, Mooretown, near Swords, on 1887 to 1913 map.
This ruin survives today.
See photo and satellite view.

The Earls Fitzwilliam of England

Sir John Fitzwilliam,
of Sprotbrough, Yorkshire,
founded in 1372 the chantry of St.Edward in St Mary's Church, Sprotbrough,
had issue:

Sir William Fitzwilliam, mar Maud Cromwell [descendant of King John] and had issue:

Sir John Fitzwilliam, mar Eleanor Greene and had issue:

  1. John Fitzwilliam,
    mar Margaret Clarell and had issue:

    1. William Fitzwilliam, of Sprotbrough, died 1474,
      brass in St Mary's Church, Sprotbrough.

  2. John Fitzwilliam,
    apparently two sons called John,
    mar Helen Villiers and had issue:

    1. Sir William Fitzwilliam, Knt..

Fitzwilliam of Aldwark, Yorkshire

Fitzwilliam of Aldwark are related to Fitzwilliam of Sprotbrough.

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