 After the death of Robert in 1085, Roger I obtained from the new duke, Roger Borsa, the whole rights over the castles in Calabria, the lordship of which he had previously shared with Robert Guiscard.In fact, the seat of Roger I's government was the Calabrian town of Mileto.According to the historians Agostino Inveges and Matteo Camera Roger I started to use the title ""Great Count of Sicily and Calabria"" since 1096.