I have made a general shift in dates to accomodate Godiva's (mother of Aelfgar) birth date according to Ancestral Roots and Encyclopedia Britannica.
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The following is excerpted from a post to SGM, 23 Jun 1999, by Leo van de Pas:
From: Leo van de Pas (leovdpas@@iinet.net.au)
Subject: Re: Lady Godiva
Newsgroups: soc.genealogy.medieval
Date: 1999/06/23
At 12:24 PM 6/23/99 -0400, you wrote:
>Leo van de Pas wrote:
>>
>> The son of Leofric and Godiva :
>>
>> Alfgar "the Saxon", Earl of Mercia,
>> died circa 1059/1062 was married to
>> Elfgifu, daughter of Sigeferth and
>> Ealdgyth.
>What is the basis for this statement. Assuming I have these names
>right, Ealdgyth would later become wife of Edmund Ironside, and mother
>of the exiled princes. It has been speculated that she was daughter of
>an earlier Ealdorman Morcar, and this would provide onomastic continuity
>with the younger Ealdorman of that name. Still, I know of no source
>that provides any clues either to the parents of Aelfgar's wife, nor
>that Sigeferth had a daughter.
>Oops [in a slightly later post]. I left out a generation. The hypothesis is that Ealdgyth was
>daughter of Aelfthryth, and maternal granddaughter of Morcar. This is
>given in Moriarty's Plantagenet Ancestry, based on an earlier hypothesis
>(by Richardson?). However, it does not include her having a daughter by
>Sigeferth, or the marriage of that daughter to Aelfgar
>taf [Todd A. Farmerie]
Last year I bought a wonderful book "The Anglo-Saxon Chronicle" translated and edited by Michael Swanton, there are a few family trees and in this is shown that Aelfgar, Earl of East Anglia 1051-1057, Earl of Mercia 1057 was married to Aelgifu, daughter of Siferth thegn of the Seven Boroughs (killed in 1015) and Ealdgyth (daughter of Aelfthryth) who secondly married Edmund Ironside, King of England. Aelfthryth (son of Wulfrun) is a brother of Aelfhelm, Ealdorman of Northumbria (killed 1006) who in turn was father of Aelgifu married to Cnut King of England. These genealogical pages are the last of the book before the bibliography. I hope you have a copy otherwise would you like me to photocopy and post?
Best wishes
Leo van de Pas