Goude ur veaj diaes e tegouezhas Janed en he bro nevez, enez Sikilia, dan 13 a viz Chwevrer 1177, hag ech euredas da Gwilherm II Sikilia ha gwiskañ a reas kurunenn Sikilia en iliz-veur Palermo. Hervez Robert of Torigny, o devoe ur mab, Bohemond, ganet e 1181, met mervel a reas en bugel; however, as there is no indication of him ever existing in any other source of the time, Torignys words are tainted by invention or misconception, not to mention that Joanna would have been 14 or 15 at this time and therefore too young for a legal conception. Goude marv William e 1189, e chomas prizoniadez etre daouarn Tancred of Sicily.