In July 1127 , William II , Duke of Apulia , died childless .
Almost immediately Duke 's 's cousin King Roger II of Sicily sailed to the mainland to occupy the duchies of Apulia and Calabria .
In July 1127 , William II , Duke of Apulia , died childless , and almost immediately his cousin King Roger II of Sicily sailed to the mainland to occupy the duchies of Apulia and Calabria .