The visit to Canada of King George VI and Queen Elizabeth was the first time that a reigning monarch had visited Canada. It was reported in The Times of 22 May 1939 that is was also the first time that members of the Royal Family had spoken to each other via a transatlantic telephone connection. Princess Elizabeth and Princess Margaret had remained in England and while staying with their uncle the Hon. David Bowes-Lyon (1902-1961) they were called by the King and Queen. They spoke for a quarter of an hour.
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George VI and Queen Elizabeth Arriving in Canada 1939
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H.M. Queen Elizabeth, her brother David and T.R.H. Princesses Margaret and Elizabeth
St. Paul's Walden Charities, Camera Press Digital