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.

Question: what was isabella's greatest accomplishment?
Self-contained rewrite: what was isabella I of Castille greatest accomplishment?