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Either this page is incorrect or the link to Guido di Toscana is incorrect. The Guido reference clearly states "None of his children survived him and when he died in 928 or 929" yet Adalberto was elevated to the nobiliary title of "Visconte" in 940. — Preceding unsigned comment added by St3class (talk • contribs) 06:27, 20 July 2020 (UTC)[reply]