The Jewess of Toledo (German: Die Jüdin von Toledo) is a play by Franz Grillparzer. Written in 1851, it was first performed in Prague in 1872, after Grillparzer's death.
The play is based on the love affair between King Alfonso VIII of Castille and Rahel la Fermosa, a Jewish woman.
"La Historia de Fermosa" by Abraham S. Marrache covers the same story, but in the form of a historical novel - Hebraica Ediciones, Madrid 2009 : http://lahistoriadefermosa.com