When toasting the Queen in the Channel Islands, one will say "The Duke of Normandy, our Queen."
According to royal historian Ben Pimlott, when the monarch visited Normandy in May 1967, French locals greeted her with the phrase “Vive la Duchesse!”, to which the Queen supposedly replied, “Well, I am The Duke of Normandy!”.
What's more, the Queen is also known as the Duke of Lancaster in the ancient Duchy of Lancaster.
Express reported that the Duchy of Lancaster has been a source of revenue for the royal family since 1399 and the national anthem in Lancaster can still be found as “God Save our gracious Queen, long live our noble Duke.”
WATCH: Brilliant footage of Her Majesty Queen Elizabeth II running and shouting
Queen Elizabeth is known as the Lord of Mann on the Isle of Man (despite her ancestor, Queen Victoria reigning as Lady of Mann).
The Queen is also known as the Duchess of Edinburgh, following her marriage to Prince Philip in 1947.
As the head of the Commonwealth, Queen Elizabeth holds 16 different regnal titles for each realm.
For instance, she is the Queen of Austalia and the Queen of Papua New Guinea.
According to Express, the Queen is known as Queen Elizabeth I in Scotland, as the first Queen Elizabeth ruled before the Acts of Union (meaning there was never an Elizabeth I on the throne).
In 2002, Winnie Ewing, the then-leader of the SNP wrote to the Queen to urge her to use the regnal name Elizabeth I, Queen of Scots when in Scotland.