The Coded message the follows is an encrypted message from Brutus to the Roman Senate. It was

Question:

The Coded message the follows is an encrypted message from Brutus to the Roman Senate. It was produced using the Caesar cipher method, in which each letter is shifted by a fixed number of places (determined by the key value).
OHWV GR MXOLXV RQ PRQGDB PDUFK 48
GUHVV: WRJD FDVDO (EBRG)

Required
Determine the key used to produce the coded message and decode it.