It is not known who this person is. The peerage.com source suggests she might have. been associated with a minot English noble family involved in the 12th–century Anglo/Cambro-Norman incursion into Ireland.
Bertha was born about 1030. Bertha Congn ... [1]
http://www.thepeerage.com/p29952.htm#i299512 Shows family in England.
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C > Cogan | G > Gogan > Bertha (Cogan) Gogan
Categories: Uncertain Existence