Siena–Pisa Conflict (1340s)

Timeline

1. 1341–1343Siena · SienaFlorentine expansionism prompted Pisa and Siena to form anti-Florence alliances at certain points, yet deep divisions remained between the two cities over Ghibelline traditions, coastal trade, and the ownership of border castles.
2. 1344–1347Maremma · MaremmaThe two sides fought repeated small wars and sieges in the Maremma region of southern Tuscany and along the Ligurian frontier, contesting salt works, trade routes, and strategic fortresses, draining both cities' finances and manpower.
3. 1348–1350Pisa · PisaAfter the Black Death devastated both cities in 1348, Siena and Pisa did not fully reconcile; around 1350 they maintained a tense standoff driven by Florentine pressure and territorial disputes, laying the groundwork for larger conflicts to come.