In April 1354, the Neapolitans, with Grand Seneschal Niccolò Acciaiuoli at the head of a small fleet, invaded Sicily and subjugated Palermo and most of the interior in alliance with the Chiaramonte and the other "filoangioini" families. Only Catania and Messina remained under Louis's control, that is, with the Catalan ("filoaragonese") faction. Fortunately for Louis, the new Neapolitan king, Louis I, refused to provide the required reinforcements and supplies to maintain the invasion. In May the king of Sicily (Trinacria) sent an ambassador to Naples to protest the invasion. On 4 June he sent out an embassy to Peter IV of Aragon to request assistance.