Actually you may have a point, i'm talking about the trait, however it clearly says Provinciae sicilia. And it should IMHO either say ProvinciA SiciliA, or ProvinciAE SiciliAE.
In the game provinciae Sicilia would actually mean provinces of Sicily, while there was only one province of Sicily. So i think it should be Provincia Sicilia. Well i'm going to sleep now, perhaps tommorow i will see my mistake