HM The Queen (Received 14th January 2020)
HRH The Duke of Edinburgh
TRH The Prince of Wales and The Duchess of Cornwall (Received 6th January 2020)
HRH The Duchess of Cornwall
TRH The Duke and Duchess of Cambridge
TRH The Duke and Duchess of Sussex
HRH The Duke of York and Family
HRH The Princess Royal and Vice Admiral Timothy Laurence
HRH Princess Alexandra plus her birthday as it is Christmas day
TRH The Earl and Countess of Wessex
TRH The Duke and Duchess of Kent
TRH The Duke and Duchess of Gloucester
Sarah, Duchess of York (Received 3rd January 2020)
TM The King and Queen (Received 23rd December 2019)
TM King Albert II and Queen Paola (Received 27th January 2020)
TRH Prince Laurent and Princess Claire (Received 5th December 2019)
TI&RH Prince Lorenz and Princess Astrid of Belgium, Archduke and Archduchess of Austria-Este (Received 4th February 2020)
TI&RH Prince Amedeo and Princess Elisabetta of Belgium, Archduke and Archduchess of Austria-Este (Received 7th February 2020)
HRH Princess Marie Esméralda of Belgium (Received 8th January 2020)
Simon & Anna de Merode (6th January 2020)
Sophie Wilmès (Received 22nd January 2020)
Bulgaria
Tsar and Tsaritsa of Bulgaria (Received 13th February 2020)
HM The Queen (Received 29th January 2020)
TRH The Crown Prince and Crown Princess
TRH Prince Joachim and Princess Marie of Denmark
France
President of France (Received 7th February 2020)
The Duke of Bavaria (Received 6th January 2020)
The Duke & Duchess in Bavaria (Received 20th December 2019)
The Duke & Duchess of Wurttemberg (Received 10th December 2019)
The Prince & Pricness de Lippe (Received 10th December 2019)
Traute, The Dowager Princess de Lippe (Received 10th December 2019)
The Duke and Duchess of Mecklenburg (Received 8th January 2020)
The Prince and Princess of Prussia
The Prince and Princess of Furstenberg
The Hereditary Prince and Princess of Furstenberg
The Hereditary Prince and Hereditary Princess of Hanover (Received 13th February 2020)
Graf and Gräfin zu Toerring-Jettenbach (Received 16th January 2020)
The Prince and Princess Sayn-Wittgenstein-Sayn (Received 20th January 2019)
The King and Queen of Greece
The Crown Prince and Princess of Greece
Ireland (not royalty but i’m Irish so)
The President of Ireland
Italy
Duke and Duchess of Aosta (Received 14th January 2020)
TSH The Prince and Princess
HSH The Hereditary Prince and HRH The Hereditary Princess
HRH Princess Margaretha of Liechtenstein
TRH The Grand Duke and Grand Duchess (Received 20th January 2020)
TRH The Hereditary Grand Duke and Grand Duchess (Received 10th December 2019)
TRH Prince Felix and Princess Claire (Received 21st January 2020)
HRH Prince Louis (Received 21st January 2020)
HRH Princess Alexandra (Received 21st January 2020)
HRH Prince Sebastian (Received 21st January 2020)
TRH Prince Guillaume and Princess Sibilla
Tessy Antony-de Nassau
Xavier Bettel (Received 14th January 2020)
TSH The Prince and Princess of Monaco (Received 24th December 2019)
Princess Stephanie of Monaco (Received 3rd January 2020)
Princess Caroline of Hanover
TM The King and Queen (Received 3rd February 2020)
TM King Juan Carlos and Queen Sofia
TM The King and Queen (Received 17th January 2020)
Norway
TM The King and Queen
TRH The Crown Prince and Crown Princess
Portugal
President of Portugal (Received 17th January 2020)
TRH The Crown Prince and Crown Princess
TRH Prince Philip and Princess Danica
TM The King and Queen
TRH The Crown Princess and Prince Daniel
TRH Prince Carl Philip and Princess Sofia
His Holiness The Pope
Pope Benidict XVI
New Year
Empress of Iran (Received 22nd January 2020)
RoyalResponses 
WOW! Awesome 🙂
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I sent a card to the Princess Royal and got back a letter from her Assistant thanking me for writing but that she does not
send replies. I bought that was a nice thing to do.
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