After the decline in theatregoing which followed the Popish Plot in 1678, Aphra Behn adhered to the general tendency among many authors of her time and turned to novel writing. Agnes de Castro is her own rendering of a tragic story with a historical base, also defined as a “sentimental tragedy” by Montague Summers in his edition of Behn’s works. The novella dramatizes the personal and political conflicts that took place at the Portuguese Court of King Afonso IV when his son, Don Pedro, falls in love with the Spanish gentlewoman Inês de Castro, his wife Constantia’s lady-in-waiting. Textually speaking Behn follows probably the original by S.B. de Brillac (1688), and her text becomes the closest source of inspiration for Catharine Tr...