Roger I., the youngest of the 12 sons of Tancred of Hauteville; conquered Sicily from the Saracens after a war of 30 years, and governed it under the title of count in part from 1071 and wholly from 1089 to 1101.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Rogation Days * Roger II.