To counter the Genoese predominance in the southern Tyrrhenian Sea, Pisa strengthened its relationship with their Spanish and French traditional bases (Marseille, Narbonne, Barcelona, etc.) and tried to defy the Venetian rule of the Adriatic Sea.
For at modarbejde Genovas dominans i den sydlige del af Det Tyrrhenske Hav styrkede Pisa sit forhold til deres spanske og franske baser (Marseille, Narbonne, Barcelona, osv.) og forsøgte at slå Venedigs overherredømme over Adriaterhavet.