Earlier quoted context omitted.
More accurate to say that at the time, there was no language known as "Spanish" - there were speakers of Latin dialects (including what became Spanish and Portuguese and Galician and Catalan &c.), speakers of Arabic, and speakers of Basque.
We are talking about 1492 here, there was already a established Spanish language That same year this was written: https://en.wikipedia.org/wiki/Gram%C3%A1tica_de_la_lengua_ca...
In addition to Castilian and Aragonese, you also had, among others, the Galician language, the Asturian and Leonese languages, and of course in the once-Muslim lands not only Ladino but also Mozarabic (which parallels Ladino in a few ways: Ladino is a close relative of Castilian spoken by Jews in Muslim lands, while Mozarabic is a close relative of Aragonese spoken by Christians in Muslim lands).