A new hilltop town founded in 1155-56 under Count Guido Guerra II's protection, with Siena's help, by the people of Marturi and neighbouring villages, and placed in Siena's diocese by Adrian IV, to Florence's anger.
It joined the Tuscan League after November 1197 and in 1199 was raided by Colle and San Gimignano (the war of Casaglia).
Who holds it
- Name
- Consuls (names not pinned)
- Title
- The commune
- Confidence
- low
Lord in 1200
The commune of Poggio Bonizio, with lordship rights of the Guidi counts (the Semifonte article counts it among the Guidi castles); the balance between town and counts in 1200 is not pinned.
How things stand that morning
Under attack from Colle and San Gimignano since 1199; its own alignment between Florence and Siena that winter is not pinned. It will host the arbiter's award on the Chianti line in 1203.
Charter
Founded 1155-56; imperial city under Frederick II (later).
Council
Consuls (names not found).
Communities
A Cathar school is reported in Poggibonsi in the twelfth century (en.wikipedia).
Fairs and markets
Markets on the Francigena at the foot of the hill (Borgo di Marturi).
Militia
Town host.
Walls and castle
The fortified hilltop of Poggio Bonizio above the old Borgo di Marturi.
Trade and crafts
Via Francigena traffic; the abbey of Marturi below.
Where the sources disagree
Evidence: Foundation and the 1199 war known; government in 1200 not found.
Sources and studies
- Poggibonsi (it.wikipedia)
- Poggibonsi (en.wikipedia)
- Colle di Val d'Elsa (it.wikipedia)
- Semifonte (it.wikipedia)
- Lega di San Genesio (it.wikipedia)
Last revised 4 November 2026. Published 4 November 2026. Suggest a correction on the OMNIA Discord.