Australia’s highest court ruled on Friday to make public letters between Queen Elizabeth II and her representative that would reveal what knowledge she had, if any, of the dismissal of an Australian government in 1975.

The High Court’s 6-1 majority decision in historian Jenny Hocking’s appeal overturned lower court rulings that more than 200 letters between the now 94-year-old monarch of Britain and Australia and Governor-General Sir John Kerr before he dismissed Prime Minister Gough Whitlam’s government were personal and might never be made public.

The only dismissal of an elected Australian government on the authority of a British monarch triggered a political crisis that spurred many to call for Australia to sever its constitutional ties with Britain and create a republic with an Australian president. Suspicions of a U.S. Central Intelligence Agency conspiracy persist.