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.