Julius Caesar was originally published in the First Folio of 1623 and it is the only authoritative text for the play. The Folio text is notable for its quality and consistency. The source used by Shakespeare was Sir Thomas North’s translation of Plutarch’s Life of Brutus and Life of Caesar.
The play contains many elements from the Elizabethan period. The characters mention objects such as hats and doublets (large, heavy jackets),which both didn’t exist in ancient Rome. Caesar is said to be wearing an Elizabethan doublet instead of a Roman toga. At one point a clock is heard to strike and Brutus notes it with “Count the clock”.