The common people of 11th Century medieval Spain spoke numerous dialects, derived from Latin and Celtic, influenced by Arabic, that had become nearly mutually unintelligible. Latin was used as a common language by the clergy and nobility.
And a Moor who understood the Latin of the country, heard them and knew what they said, and he went to Abengalvon, and said unto him, Acaiaz, that is to say, Sire, take heed, for I heard the Infantes of Carrion plotting to kill thee.