 Some biographers have surmised that a compromising liaison with Leonora d'Este came to light, and that Tasso agreed to feign madness in order to cover her honor, but of this there is no proof.It is only certain that from Belriguardo he returned to a Franciscan convent at Ferrara, for the express purpose of attending to his health.There the dread of being murdered by the duke took firm hold on his mind.