I read & liked this novel too. Have you read Feuchtwanger's Die Jüdin von Toledo (read it in Russian under the name of Spanische Ballade)? Iirc, it was the first book I read & absolutely loved it.
From wiki: Die Jüdin von Toledo is a 1955 novel by German-Jewish writer Lion Feuchtwanger. The story focuses on the "Golden Age" of learning in medieval Spain. The novel also describes the affair of Alfonso VIII with the Jewish Raquel in Toledo. In Lion Feuchtwanger's prologue to the story, he mentions that the ballad was originally written by Alfonso X of Castile in regards of his Great-Grandfather (Alfonso VIII).
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From wiki:
Die Jüdin von Toledo is a 1955 novel by German-Jewish writer Lion Feuchtwanger. The story focuses on the "Golden Age" of learning in medieval Spain. The novel also describes the affair of Alfonso VIII with the Jewish Raquel in Toledo. In Lion Feuchtwanger's prologue to the story, he mentions that the ballad was originally written by Alfonso X of Castile in regards of his Great-Grandfather (Alfonso VIII).