St. Benedict the Moor was born 600 years after the first King!
The show is set in the 10th century, after the Fall of the Roman Empire. Why would a Spanish Monk travel to England anyway?
St. Benedict lived in the 16th century. I assume the Moors (Ottomans) occupied Spain and they were slave traders. https://www.catholic.org/saints/saint.php?saint_id=871