"Marie de Bourbon" is not the sister of "Bonne de Bourbon"

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In the context: "There, Amadeus learned that Marie de Bourbon, daughter of Duke Louis I of Bourbon, whose sister Bonne was Amadeus's wife". Actually, there is no evidence that Marie and Bonne are sisters! Their articles show different parents and spouses. If someone could double check that and reconfirm it, then we need to remove the sentense: "whose sister Bonne was Amadeus's wife", unless we find the proper relationship. --Yahia (talk) 15:19, 11 December 2021 (UTC)Reply

Well, I verified the original with the source (Cox 1967, p. 214), but it is clearly wrong. Cox says that Marie was the daughter of Louis II and thus a niece of Bonne (because Louis II and Bonne were siblings). He seems to have gotten his wires crossed. It was Bonne who was a niece of Marie, since her father (Peter I) and Marie were siblings, both children of Louis I. Louis II, Bonne's brother, has nothing to do with anything here. My suspicion is that Cox made one slip that caused him to make a second, perhaps misnumbering Louis and then switching the relationship between Marie and Bonne or vice versa. Or perhaps he simply failed to correct all the errors in the primary source. The basic fact—that Amadeus's wife and the princess of Achaea were related—is unchanged. Thanks for spotting this and please double check my correction. Srnec (talk) 16:26, 11 December 2021 (UTC)Reply
  • I see that you replaced "sister" by "niece", which is what I wanted initially and aimed: not to disturb the community by such change without public record. Sure they are both from Bourdon's house and Bonne is the niece of Marie, since Peter I, Duke of Bourbon was Marie's elder brother and Bonne's father. On the other hand, I have already corrected this evening Marie's father "Louis I", instead of the incorrectly written "Louis II" as it was so obvious and a small correction. Great, thanks.   --Yahia (talk) 20:02, 11 December 2021 (UTC)Reply