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According to the article it seems that William VIII was succeeded by his daughter, Marie, and not by a William IX. RCNesland (talk) 01:51, 10 June 2013 (UTC)
Well, William VIII and his first wife Eudokia (whom he repudiated and sent to the monastery in Ariane in 1187) were both patrons of the famous troubadour and latterly Bishop of Toulouse, Fulk of Marseille, and that's how in her thesis Nicole Morgan Schulman writes on this subject (From Lover to Villain, from Sinner to Saint: the Varied Career of Folco, Troubadour, Monk, and Bishop of Toulouse, c. 1150-1231, National Library of Canada, Ottawa 1998, p. 55): Schulman states that William's daughter, Marie, was first wedded to Barral, the Viscount of Marseille, who died soon after their marriage. However, after WilliamVIII's repudiation of Eudokia, he "subsequently took a new wife (whom the Church refused to recognize)" (ibid., p. 52, n. 46), and later, following Barral's death, he would disinherit Marie in 1202, "in favour of his children from his second (uncanonical) marriage" (ibid, p. 55, n. 61). Wikipedia's pages in other languages additionally confirm that William IX was the first-born of this second relationship, and his mother was Agnes of Castile, niece of Queen of Aragon, Sancha of Castile, about twelve years younger than Eudokia. Hope it is enough explanation of the issue. — Preceding unsigned comment added by Rubor Sanguinis (talk • contribs) 09:29, 19 June 2014 (UTC)