Black , through his holding company Ravelston Corporation , owned 78 % of Hollinger Inc. which in turn owned 30 % of Hollinger International .
Canadian businessman Conrad Black , through companies controlled by him , bought the Telegraph Group in 1986 .
Black , through Conrad Black 's holding company Ravelston Corporation , owned 78 % of Hollinger Inc. which in turn owned 30 % of Hollinger International .
Canadian businessman Conrad Black , through companies controlled by him , bought the Telegraph Group in 1986 .