21 books in series

The Royal Diaries

The Royal Diaries is a 21-book series with 21 released primary works first released in 1999 with contributions by Kristiana Gregory, Kathryn Lasky, Patricia C. McKissack, Carolyn Meyer, Ellen Emerson White, Laurence Yep, Anna Kirwan, Patricia Clark Smith, Sheri Holman, Barry Denenberg, and Edwidge Danticat.

Elisabeth
Kristina
Kazunomiya
Lady of Palenque
Lady of Ch'iao Kuo
Sŏndŏk
Weetamoo
Anacaona
Victoria: May Blossom of Britannia, England, 1829
Mary, Queen of Scots, queen without a country
Elizabeth I, red rose of the House of Tudor
Jahanara, Princess of Princesses
Marie Antoinette, princess of Versailles
Catherine
Cleopatra: An Egyptian Princess's Diary, AD 57
Eleanor: Crown Jewel of Aquitaine, France, 1136
Elisabeth of Austria: The Princess Bride
Isabel
Kaiulani
Nzingha, warrior queen of Matamba
The Royal Diaries : Elizabeth I, Isabel Jewel of Castilla, Cleopatra VII, Marie Antoinette - Boxed set of 4
Marie Antoinette: Princess of Versailles, Austria-France 1769