Brutus had married Cato’s daughter and shared many of Cato’s ideas. Round him there gathered a knot of men, among whom the ablest was Caius Cassius, who determined to free the city of the tyrant. To the minds of Brutus and Cassius it seemed that Caesar was destroying the seeds of greatness in all other men, to make himself supreme. Shakespeare makes Cassius argue thus:

The Penalty of Greatness

Cassius. Why, man, he doth bestride the narrow world

Like a Colossus; and we petty men

Walk under his huge legs, and peep about

To find ourselves dishonourable graves.

Men at some time are masters of their fates:

The fault, dear Brutus, is not in our stars,

But in ourselves, that we are underlings.

Brutus and Caesar: what should be in that ‘Caesar’?