Genealogy research by Mark Humphrys.
John Fitzgerald, 1st Earl of Kildare.
The arms of Fitzgerald, Earl of Kildare and Duke of Leinster.
From
Cracroft's Peerage.
The old flag of Ireland,
the Cross of St.Patrick.
This was invented in
1783.
It has been suggested (but not proved) that it came
from the arms of
Fitzgerald, Duke of Leinster.
Since 1801 the Cross of St.Patrick
forms part of the Union Jack.
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