'Spain' at this time does not exist but the Iberian peninsula consisted of five kingdoms [in order of size Castille, Portugal, Aragon, Granada and Navarre]. With the Christian nations of Castille, Portugal, Aragon and Navarre considering the Eastern Orthodox Byzantines to have been 'infidels' rather than 'true' [Catholic] Christians which would have made them reluctant if not hostile to them to providing refuge AND the existence of the Muslim kingdom of Granada, I cannot see any reason why the Byzantines would have risked everything to go far away [to say nothing of the Iberian spoken languages having only some vestiges of Greek and an entirely different alphabet].