Simplify the following text for a Grade 4 native English-speaking person.
Original: Alfonso III of LeÃ n and GarcÃ a I of LeÃ n made LeÃ n city the capital of the Kingdom of LeÃ n and the most important of the Christian cities in Iberia .
Simplified: LeÃ n was is the capital of the Kingdom of LeÃ n , an ancient country .