Conversation so far:
what does granada mean?
Granada is the capital city of the province of Granada,
did Ferdinand II of Aragon and Isabella I of Castile conquer granada?
It took Ferdinand II of Aragon and Isabella I of Castile ten years to conquer Granada culminating in 1492.
what was isabella I of Castille greatest accomplishment?
Isabel I of Castille marriage to Ferdinand II in 1469 became the basis for the de facto unification of Spain
what is the most important fact in the Isabel I of Castile article?
Isabella I of Castile reorganized the governmental system, brought the crime rate to the lowest in years, and unburdened the kingdom of the debt her brother left behind.
Are there any other interesting aspects about the Isabella I of Castille article?
Under Isabella I of Castile patronage, De Córdoba went on to an extraordinary military career that revolutionised the organisation and tactics.

Question: what organisation?
Self-contained rewrite: what organisation was revolutionized by De Cordoba under Isabella I of Castile's patronage?