Genealogy research by Mark Humphrys,
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Viscount Fitzwilliam arms
Viscount Fitzwilliam arms as given in [The present peerages, Joseph Edmondson, 1785].
Viscount Fitzwilliam arms as given in [Lodge's Peerage of Ireland, 1789].
The Viscount Fitzwilliam arms given above do not look like the stone arms at Merrion.
They do look similar to the Earl Fitzwilliam arms.
However [Wilkinson, 1925] says the Viscount Fitzwilliam arms should be quite different to the Earl Fitzwilliam arms.
[Ball, vol.2, 1903] says that Fitzwilliam of Merrion (cr Viscounts in 1629) ceased to use their own arms in the 17th century and adopted the arms of the other Fitzwilliam family (cr Barons in 1620, cr Earls in 1716) since they considered them to be related.
This suggests that the stone arms at Merrion could be the old Fitzwilliam of Merrion arms.
See 2012 photo.
The head and plaque.
From Mount Merrion 300. Used with permission.
Arms of the Earls Fitzwilliam.
Arms of Fitzwilliam College, Cambridge.
The college's coat of arms first came into use in the 1880s. The Fitzwilliam Viscounty was extinct by this time, so they asked the Earl Fitzwilliam for permission to use his arms, even though the Fitzwilliam Museum and nearby Fitzwilliam St are not linked to his family. (To be fair, even the link of the college to the Viscounts would be tenuous.)