Earl Grey, Governor General of Canada, 1904 to 1911, bought the landau from the governor general of Australia and brought it with him to Canada. When his time as governor general ended, he left the landau in Ottawa to be the permanent official carriage. By the end of the second world war it was no longer in use. The landau was brought back into service by Vincent Massey in the 1950s, when he became governor general, and remains in use today.
From – “Now You Know Royalty” by Doug Lennox 2009