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BRUCE, Isabel 1
Another name for Isabel was DE BRUS, Isabel.2
There are various suggestions as to the family relationship of this woman to the famous Bruce family, none of which appear as definitive.
"A number of sources suggest that the King's father Robert (1253-1304) married secondly, after 1292, a lady named Eleanor (died 1331) by whom he had a daughter, Isabel de Bruce, who married Thomas Randolph, Lord Chamberlain of Scotland."
"Isobel Bruce is often recorded as having married Sir Thomas Randolph of Strathdon, Great Chamberlain to Alexander III, and to have been the mother by him of King Robert Bruce's faithful lieutenant Thomas Randolph, Earl of Moray; the person of this Profile. This is extremely unlikely to be correct and there is no proof for this assertion. It is discounted entirely by Sir James Balfour Paul in The Scots Peerage where he provides evidence to support his position. Randolph certainly seems likely, given his position in the Scottish Wars of Independence, to have married into the Bruce family but it is not clear to which lady."
from Wikitree on Randolph 2
Internet Site, http://www.clanmacfarlanegenealogy.info/genealogy.
Internet Site, https://www.wikitree.com/wiki/Randolph-192.