Like his son Prince Charles , Letters Patent amending the Constitution of the Order of Australia were required for him to become a substantive knight .
Jump up ^ Prince Philip was previously a Companion of the Order in the Military Division prior to his appointment .
Like Prince Philip 's son Prince Charles , Letters Patent amending the Constitution of the Order of Australia were required for him to become a substantive knight .
Jump up ^ Prince Philip was previously a Companion of the Order in the Military Division prior to his appointment .