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

Question: what is the most important fact in this article?
Self-contained rewrite: what is the most important fact in the Isabel I of Castile article?