Fortezza di Montalcino (Fortezza Trecentesca e Porta al Cassero)

Montalcino's fourteenth-century fortress is a pentagonal stronghold built by Siena in 1361 on the hill known as Poggio del Barlanzone.

Why it matters

The fortress guarded Siena's southern frontier against Florence and reflects the strategic importance of Montalcino. Its unusual pentagonal plan incorporates older structures and remains a clear record of the military architecture of the period.

What to notice

Five angled walls and towers define the fortress. Within the courtyard are remains of the church of Sant'Egidio and the mastio keep, whose vaulted rooms, cistern and narrow openings recall the garrison's life. The bastion of San Giovanni, added under Cosimo I de' Medici, marks a later phase of defence. The structure overlooks the Brunello landscape.

Context and history

Siena began the fortress in 1361. During the Sienese wars, Montalcino became the last stronghold of resistance after the republic fell, surrendering in 1559. Cosimo I later added the southern bastion. The complex shifted to civic uses after its military role ended. From 1787 the San Giovanni bastion served as the town cemetery until a modern burial ground opened. Restoration consolidated the structure in the 1930s.