How much money did it actually make ?
Because of its colourful history - police seizures, court cases etc. Caligula never had any sort of normal release structure. Its played for long periods in mainly independent theatres (over 14 months in the Prince Charles theatre in London for example), so accurate recordings of box office takings would be difficult to estimate.
Malcolm McDowell contends that it must have taken over $100 million worldwide - but that officially it is nowhere close to this otherwise he would be due several large profit participation payments.
"Thank God For Darwin"