Title: De rebus gestis Rogerii Calabriae et Siciliae comitis et Roberti Guiscardi ducis fratris eius
Subjects: History, Sources, Normans
Places: Sicily (Italy), Italy
People: Ruggiero I conte di Sicilia (1031-1101), Robert Guiscard Duke of Apulia, Calabria, and Sicily (approximately 1015-1085)
Time periods: 1016-1194, 476-1268