 The biography of Alexander by Oxford University professor  Robin Lane Fox (qv) was an original inspiration and source of  information for director Oliver Stone (I) (qv). As an historical  advisor, Professor Fox didnt get an on screen credit; his price for  giving his advice was to be allowed to take a place at the head of  what is one of the largest cavalry charges ever filmed. Professor  Fox was used to riding around the English countryside, but gladly  dressed up as a Macedonean cavalry officer to live his dream of  charging for Alexander.