A prequel is a movie, book, or other work that is composed after another, but shows or describes events before it. For instance, in The Chronicles of Narnia, The Magician's Nephew is a prequel to The Lion, the Witch, and the Wardrobe.
... Ferdinand in 1516, Charles became joint-king of Castile with his mother (who was insane), and also inherited Aragon, Navarre, Granada, Naples, Sicily, Sardinia, and ...