For more new books about royalty see:

FRANCE
Author: Pierre Branda.
Title: Napoléon à Sainte-Hélène (Napoleon at Saint-Helena).
Publication: 8 January 2021 by Perrin.
Language: French:

GERMANY (HESSEN)
Author: Annotated and expanded by Arturo E. Beéche and Ilana D. Miller.
Title: Recollections. Victoria Marchioness of Milford Haven, Formerly Princess Louis of Battenberg.
Publication: 1 January 2021 at Eurohistory.com.
Language: English.

GERMANY
Author: Anna Eunike Röhrig.
Title: Der Clan Friedrichs des Großen. Ein König mit 13 Geschwistern (The clan of Frederick the Great. A king with 13 siblings).
Publication: 1 January 2021 by MatrixMedia.
Language: German.

ROMANIA
Author: Paul Lindenberg.
Title: König Karl von Rumänien (King Carol of Romania).
Publication: 9 January 2021 by Classic-Library.
Language: German.

UNITED KINGDOM
Author: Clive Irving.
Title: The Last Queen. Elizabeth II’s Seventy Year Battle to Save the House of Windsor.
Publication: 5 January 2021 by Pegasus Books.
Language: English.

UNITED KINGDOM
Author: Christopher Warwick, Reuel Golden (ed.).
Title: Her Majesty. A Photographic History 1926-Today.
Publication: 15 January 2021 by Taschen (updated edition).
Language: English.

UNITED KINGDOM
Author: Daniel A. Willis.
Title: The Complete Line of Sucession 2021.
Publication: 2 January 2021 by House of Willis Publishing.
Language: English.