Challenging stylometry: The authorship of the baroque play La Segunda Celestina.

This article investigates the disputed authorship of the anonymous ending of the Baroque play *La Segunda Celestina*, originally commissioned to Spanish playwright Agustín de Salazar and left unfinished at his death in 1675. Using a first systematic stylometric analysis—applying computational authorship attribution and verification methods on a carefully constructed corpus of Spanish Golden Age drama—the study finds strong quantitative evidence supporting the hypothesis that Sor Juana Inés de la Cruz, a prominent Hispanoamerican writer, authored the anonymous ending and possibly edited the entire play. The analysis also reveals stylistic influence from Antonio de Solís in parts of the anonymous section, suggesting potential collaboration or thematic connections. The study highlights challenges in corpus construction and authorial signal detection for historical texts but demonstrates how stylometry can contribute to resolving complex literary attribution questions.