War fleets often benefited from these facilities or rulers established state dockyards in much the same part of the port. There were certainly yards of this kind in Sicily, at Palermo and Messina. That at Messina which may have had as many as ten galley sheds, was used by Charles of Anjou in the later thirteenth century when he pursued an active policy of galley building both here and at Marseille.11 In the western Mediterranean both Pisa and Genoa, great rivals for the domination of the trade routes of the area, also had shipyards described as arsenals. In Pisa some sort of communal facility seems to have existed.