The Queen was not informed in advance about the 1975 dismissal of Australian Prime Minister Gough Whitlam, newly released letters show.
Mr Whitlam's government was removed by The Queen's representative at the time, Governor-General Sir John Kerr, and replaced with an opposition party.
It is considered the most controversial event in Australian political history.
The letters, released after a court battle, show Sir John wrote it was "better for Her Majesty not to know".
Read more: https://www.bbc.com/news/world-australia-53386554