Richard Fletcher, the British Historian, writes as follows in The Quest for El Cid about the prosperous Moorish culture centered in Cordova during the late 10th Century:
"Slaves were imported into Spain and a high proportion of them were re-exported. Here is Ibn Hawkal [the Arab traveler who in 948 published "Description of the World", which included an account of Spain based on his travels there] again:
"An important export commodity is slaves, young men and women, who are brought in from Francia and Galacia; also Slav eunuchs. All the Slave eunuchs in the world come from Spain. They are castrated in this country; the operation is performed by Jewish doctors."