Aeneas MacKenzie

Aeneas MacKenzie, or Æneas MacKenzie (August 15, 1889 in Stornoway, Scotland – June 2, 1962 in Los Angeles), was a Scottish-American screenwriter. MacKenzie wrote many notable Hollywood films, including: The Private Lives of Elizabeth and Essex (1939), They Died with Their Boots On (1941), Ivanhoe (1952), and The Ten Commandments (1956).

From Wikipedia.