The purpose of this little essay is to address one living medieval aspect pertaining to the Northeast region of Brazil. It shall be a matter of comprehending the myth of the apocalyptic return of Dom Sebastião, the king of Portugal (1554-1578), who would not have properly passed away during the Battle of the Three Kings (1578). As a matter of fact a very different sort of bane would have come about. After having been defeated in the typically Cruzade battle of Alcácer-Quibir, in Marocco, the king would have vanished from the battle field, to loose his human shape and, by dint of a mysterious charm, acquire the form of a bull. Furthermore, there is a huge eschatological hope still cherished by the poor population dwelling on the islands inhering the location of Lençóis, in the Brazilian state of Maranhão. On the islands of Lençóis, the so charmed king expects the day of his return, when a millenial kingdom of justice shall be installed. Such intriguing presence of a medieval heritage concerning the hopes and devotional practices of very poor portions of Brazilian population shall be the matter upon which we cast historiographical doubt in this paper. Actually, though not completely or being the only historical explanation, Portuguese colonization in America features a profound medieval impregnation in terms of the imaginary regarding the colonial society, which continues to take effect in nowaday Brazilian society, specially behooving historically excluded strata of the population.