With a capital located at Palermo, for 10 points, name this island southwest of the boot of Italy, which is home to the Mafia.
During the Peloponnesian War, Athens mounted a disastrous "Expedition" to this island. Angevin rule of this island was overthrown in its namesake "Vespers." Operation Husky targeted this island and was the first successful invasion of Europe by the Allies during World War II. This island's crown was united with that of Naples to create the "Kingdom of the Two" of this island. With a capital located at Palermo, for 10 points, name this island southwest of the boot of Italy, which is home to the Mafia.
During the Peloponnesian War, Athens mounted a disastrous "Expedition" to this island.
{Sicily} [or {Sicilia}; or {Sicilies} after "Two"]