Note. Richardson in Royal Ancestry 2013 Vol. II page 16 states that her surname was unknown.
2 Mar 1999 posting of John Carmi Parsons on soc.genealogy.medieval states: "The evidence for Margaret's Guines filiation was first presented in my article, "Eleanor of Castile and the Countess Margaret of Ulster,"
daughter of Arnoul de Guines III and Alice de Coucy, Margaret was a 2nd cousin once removed of Queen Eleanor, who almost certainly had a hand in arranging the Guines-Ulster marriage. Through her Coucy descent, Margaret was also a first cousin of Alexander III of Scotland, Edward I's brother-in- law. This Scottish connection had apparently resulted, a year or so before Margaret married Richard de Burgh, in the marriage of her brother Enguerran de Guines to the Scottish heiress Christian de Lindsay, whose issue ultimately became the senior heirs of line to King David I of Scotland.
"Margaret was emphatically not a daughter of John de Burgh of Lanvallay, grandson of the infamous justiciar John de Burgh. The younger John did leave 3 daughters, two of whose marriages are well attested (neither one to Richard de Burgh nor any member of that family); the third, who was named Margaret, had become a nun before her father died, so the inheritance was divided only between her two elder sisters. The inheritance was never subsequently re- apportioned to provide for the third sister or any of her issue, and she evidently remained in her cloister to die unmarried and childless. " (Ref: http://archiver.rootsweb.ancestry.com/th/read/GEN-MEDIEVAL/1999-03/0920421247 )
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Margaret is 25 degrees from Emeril Lagasse, 25 degrees from Nigella Lawson, 24 degrees from Maggie Beer, 40 degrees from Mary Hunnings, 34 degrees from Joop Braakhekke, 30 degrees from Michael Chow, 26 degrees from Ree Drummond, 26 degrees from Paul Hollywood, 25 degrees from Matty Matheson, 28 degrees from Martha Stewart, 32 degrees from Danny Trejo and 30 degrees from Molly Yeh on our single family tree. Login to find your connection.
https://en.wikipedia.org/wiki/Richard_%C3%93g_de_Burgh,_2nd_Earl_of_Ulster
Or can these alternatives be in some way reconciled into one truth? I don't know this family well but I see the disconnect in my family tree on Ancestry and would like to "fix it" here with advice of experts in this chunk of the mega-family-history-tree!
I see the "emphatic" sourcing quote provided... but I'm not sure we can ever definintely source anything from Rootsweb or Ancestry itself, and aside from the one book all the other online sources could easily be fruit of the same e-tree. What are the original, primary source materials?