One Of the three (Caesar, Brutus and Cassius) person is a king, other is a bureaucrat, and one a spy.
The king always tells the truth, the bureaucrat always lies, and the spy can either lie or tell the truth.
Caesar says: 'Cassius is a bureaucrat.'
Brutus says: 'Caesar is a king.'
Cassius says: 'I am the spy.'
Who is the king, who the bureaucrat, and who the spy ?