The coalition received a major blow with outbreak of the Sicilian Vespers in 1282, which were partly fomented by Michael VIII's diplomacy and distracted Charles I in the West, where he lost Sicily and retained only the Kingdom of Naples.
A coalición recibiu un duro golpe co brote das Vésperas Sicilianas en 1282, que foron fomentados en parte pola diplomacia de Miguel VIII e distraeron a Carlos I no oeste, onde perdeu Sicilia e só conservou o Reino de Nápoles.