Like several Marrano writers (such as Juan de Valladolid), Ferrús simulated the Christian faith while mocking his former co-religionists in his poetry.
Unfortunately, this sleep is disturbed by "Jews with long beards and slovenly garments come thither for early morning prayer.
Ferrús makes an early reference to chivalric romances when he compares, for example, his love for his lady with the riches owned by Rrey Lysuarte (King Lisuarte).
(This poem is thought to have been written prior to the anti-Semitic riots of 1388-1391, due to the tongue-in-cheek humor present in the poet's complaints about his former co-religionists and in the rabbis' response, which would have been impossible towards the end of the century).
Dezir de Pero Ferruz al Rey don Enrique (1379; written in the year of Henry's death).
These include Geryon, Cacus, Scipio Africanus, Joshua, King David, Arthur, Galahad, Roland, Amadis de Gaula, Saladin, Bernardo del Carpio, El Cid, and Ferdinand III of Castile.