Equality between men and women has been a long, complex, and silent struggle. As with history in general, societies tend to forget past events easily. Therefore, analysing spoken words and written texts is essential to understanding the context in which works were created and, more broadly, the realities of different historical periods. In this regard, the Spanish Golden Age of Theatre provides a vast, rich, and diverse collection of works that allow for the study of male and female participation, serving as a starting point for analysing gender equality in that era. This paper focuses on a selection of plays written by Lope de Vega, one of the most prolific, influential, writers of the period, with the aim of classifying the characters portrayed in his works. To achieve this pre-trained BERT models were used for this task, yielding accuracy and meaningful results. This approach prides a novel perspective in Lope de Vega’s play, achieving a F1-score = 0.98.