is likely because the Spanish crown, to maintain the monopoly of its overseas companies and to restrict those people not belonging to Spanish rule, did not allow languages other than Castilian to be spoken. This meant that those invited to participate in the colonization of Indian companies, and foreigners in general, had to learn the official language, i.e., Castilian, hence the prevalence of Castilian-Basque-speaking bilinguals. Despite these restrictions, it is still possible to trace the history of Colombia's ties to the ancient language of the Basques. A reference that has use of Euskera in Colombian territory occurred in relation to Lope de Aguirre, a native of Gipuzkoa nicknamed "The Madman". Aguirre's rebellion defied the Spanish empire, carrying out acts against the subjects of the Spanish crown. Pedro de Ursúa, a Navarrese faithful to the Spanish king, who was also the founder of Pamplona in eastern Colombia, said that he could persuade the soldiers to be part of Aguirre's revolt, if they spoke in Euskera. During the seventeenth and eighteenth century Basque families from Northern Spain settled in the Aburrá Valley where Medellín and Envigado are located, as well as small towns in eastern Antioquia, such as Marinilla, El Retiro and El Santuario. This part of Antioquia reminded these families of northern Spain. Sephardi Jews There is debate about Jewish ancestry in the Paisa people. It was known that some Spanish and Portuguese New Christians of Sephardic Jewish ancestry (some of whom continued to practice Judaism secretly, and were also known as marranos, Spanish for swine) fled the Cartagena de Indias Inquisition and took refuge in the Antioquian mountains during the sixteenth and seventeenth century. Some Colombian authors like Jorge Isaacs and Miguel Ángel Osorio have claimed that it is indisputable that Paisas have Jewish ancestry. Several Paisa surnames are known to have been prevalent among New Christian conversos of Sephardic Jewish origin, for example Espinosa, Pérez, Mejía, and many others. Some scholars state that the presence of Sephardic Jews among the ancestors of Paisas is a fact, but it does not mean that all Paisas descend from them, nor that it is the only or predominant element among those that do, as is proven by the Paisas' descent from other groups like Basques, Extremadurans, and Andalusians. Canarians There are records also of presence of some Canarians and Canarian families, at least some of them known to be from Lanzarote, who