Rule
Soon after his succession, probably in 1058, Guiscard separated from his wife Alberada because they were related within the prohibited degrees. Shortly after, he married Sichelgaita, the sister of Gisulf II of Salerno, Guaimar's successor. In return for giving him his sister's hand, Gisulf demanded of Guiscard that he destroy two castles of his brother William, count of the Principate, which had encroached on Gisulf's territory.
The reformist Papacy, at odds with the Holy Roman Emperor (the Investiture Controversy) and the Roman nobility itself, resolved to recognize the Normans and secure them as allies. Therefore at the Council of Melfi, on 23 August 1059, Pope Nicholas II invested Guiscard as duke of Apulia, Calabria, and Sicily. Guiscard, now "by the Grace of God and St Peter duke of Apulia and Calabria and, if either aid me, future lord of Sicily", agreed to hold his titles and lands by annual rent of the Holy See and to maintain its cause. In the next twenty years he undertook a series of conquests, winning his Sicilian dukedom.
Read more about this topic: Robert Guiscard
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