Original: In 1546 part of the island was handed over to Cosimo I de ' Medici , who fortified Portoferraio , renaming it '' Cosmopoli '' , while in 1577 the rest of the island returned to the Appiani .
Simplified: In 1546 part of the island was controlled by Cosimo I de ' Medici . In 1577 , the rest of the island was returned to the Appiani .