1151 – The local ruling class (the boni homines) signed an agreement with Siena, through which they assumed a series of obligations and responsibilities of an economic and military nature.[4]
1179 – In conflict with the people of Grosseto, Count Ildebrandino VII[it] began a project to build a new settlement on the Moscona hill, but it ultimately failed.[5]
13th century
1203 – Count Ildebrandino VIII[it] established an agreement with Siena for the salt trade. The presence of an early municipal government managed by the consuls in Grosseto is documented.[6]
1204 – The municipal government of Grosseto was recognized by Count Ildebrandino VIII with the promulgation of the Carta Libertatis, which defined the jurisdictional and economic relations between the local population and the Counts of Aldobrandeschi.[6]
1213 – Manto di Guglielmo appointed viscount of Batignano by the Aldobrandeschi.[7]
1221
New agreement for the local commerce between the Aldobrandeschi and Siena.[8]
The Palazzo del Comune (Municipal Palace) is attested.[9]
Emperor Frederick II granted protection to the city and the county as part of his imperial domain.[10]
1224 – The people of Grosseto did not honor the agreements made with Siena and the counts in 1221. On September 8, the city was besieged, set on fire, and violently conquered by the Sienese.[11] The people of Grosseto were forced to sign an agreement of subordinacy. From this moment, the "subordinate alliance" of Grosseto with the Republic of Siena began.[11]
1236 – Count Guglielmo Aldobrandeschi[it] sided with Pope Gregory IX against the imperial power of Frederick II, who was supported by the Sienese. Rebelling of the people of Grosseto against the count, incited by Siena.[12]
1240 – After accusing Count Guglielmo of treason, the empreror occupied Grosseto and designated it as one of the seats of the imperial vicar in the former March of Tuscany, placed under the direct control of Pandolfo di Fasanella.[13]
1243 – Emperor Frederick II began residing in Grosseto during the winter, due to its strategic position in the center of the peninsula and to practice falconry.[13]
1246 – Informed of the conspiracy of Capaccio[it], orchestrated by Fasanella himself, the emperor hastily left Grosseto in the month of March.[13]
1251
Grosseto controlled by the Sienese in the name of the emperor.[14]
1259 – Grosseto refused to recognize King Manfred's authority, aligning itself with the Guelph faction. Ghibelline Siena occupied the city and expelled the political enemies.[16]
1261 – Greater Sienese control over Grosseto, with the obligation to appoint a Captain of the People from Siena, in order to avoid King Manfred's anti-Sienese policy.[16]
1262 – In June, Grosseto and Siena ratified a treaty of mutual societas, attempting to avoid further escalation with the imperial power.[16]
1264 – It was permitted for the exiles of the Guelph faction to return to the city, as long as they adhered to the municipal statutes and pledged allegiance to both Siena and King Manfred.[16]
1266
March 6 – After Manfred's death, the Aldobrandeschi led by Count Ildebrandino the Red occupied Grosseto and established new agreements with the people, in an attempt to oust Siena from control of the territory.[17]
July 11 – Siena took control of the city again, entrusting it to its representatives.[17]
1271 – After the defeat at Colle Val d'Elsa the previous year, the Guelph faction prevailed in Siena. In Grosseto, it led to the rise of the pro-Sienese faction, which brought a period of peace between the two cities (pax guelfa).[17]
1277 – New agreement between the two cities, signed by podestà Scozia Tolomei from Siena, as veram et firmam unionem, societatem et compagniam ("true and solid union, society and company"), which transformed Siena's hegemonic claims into a nearly equal footing with the ally.[17]
1282 – Treaty by which Siena became guarantor of Grosseto's protection against the attempts of the Aldobrandeschi to reestablish feudal authority.[18]
1310 – Failed rebellion led by Bino degli Abati del Malia[it], son of Abate di Manto of Batignano, in an attempt to break away from the alliance with Siena.[19]
1312 – Taking advantage of Henry VII's descent into Italy, Bino led a second rebellion and took control of Grosseto.[19]
1317 – Treaty of alliance between Vanni[it], who succeeded his father Bino, and Siena, which tolerated the almost "signoria" of the Abati of Malia over the city, while maintaining a certain control.[19]
1325 – A contingent of knights from Grosseto participated in support of the Sienese at the battle of Altopascio against the Florentines.
1328 – In September, Grosseto was besieged by imperial troops of Duke Louis the Bavarian and the antipope Nicholas V, who aimed to take the city away from the Guelphs and return it to the Aldobrandeschi. After four days of siege, the imperial army withdrew unsuccessfully.[19]
1331 – A peace treaty was signed between Siena and the Aldobrandeschi, which also involved the Abati del Malia.
1334 – Vanni degli Abati del Malia died at the beginning of the year. On January 13, the Sienese took advantage of this to occupy Grosseto and transport Vanni's two sons and his brother, Abbatino[it], to Siena as prisoners; they were later released but with the obligation to remain in Siena. The Republic reformed the statutes of the municipality of Grosseto and ordered the construction of a Cassero to defend the city.[19]
1335
July 25 – The Abati del Malia, led by Abbatino, expelled the Sienese military garrison and halted the construction of the Cassero, regaining control of Grosseto.
November 23 – The city was again besieged by the Sienese, but the Abati managed to maintain control with the help of Pisa.
1336 – Definitive conquest of Grosseto by Siena, which reached an agreement with Abbatino for the cession of the city in June.[19]
1338 – Sienese measures decreed the end of the autonomy for Grosseto and its full incorporation into the Republic of Siena.[19]
1345 – Reconstruction of the city walls by the Sienese and completion of the Cassero.[21]
1348 – Black Death plague.[22] A slow decline began for Grosseto that would last for centuries.
1355 – Confirmation of the old imperial privileges by Charles IV, which led to a new rebellion immediately suppressed by the Sienese.[21]
1357 – Pact establishing the transfer of the imperial privileges of Grosseto to Siena and the request for a symbolic act of submission, through an annual donation on the occasion of Siena's patron saint festival.[21]
1765 – Privatization of the land assets of the Opera del Duomo of Grosseto (10,000 hectares), divided into approximately 30 estates and sold to private individuals.[46]
↑ "Gorarella". Atlante storico topografico dei siti di interesse storico e culturale del Comune di Grosseto. Archived from the original on 5 March 2016.
↑ "S. Giuseppe". Atlante storico topografico dei siti di interesse storico e culturale del Comune di Grosseto. Archived from the original on 2014-01-06.
Adriano Arzilli (1998), Il 1919 e il 1920 nella provincia di Grosseto: lotte sindacali, elezioni politiche e amministrative, amministrazione provinciale e comunale di Grosseto, Roccastrada: Il mio amico
Stefano Campagna; Adolfo Turbanti (2022), Antifascismo, guerra e resistenze in Maremma, Arcidosso: Effigi
Enrico Crispolti; Anna Mazzanti; Luca Quattrocchi, eds. (2006), Arte in Maremma nella prima metà del Novecento, Milan: Silvana Editoriale
Valeria Galimi, ed. (2018), Il fascismo a Grosseto. Figure e articolazioni del potere in provincia (1922-1938), Arcidosso: Edizioni Effigi
Giovanni Antonio Pecci (2013), Mario De Gregorio; Doriano Mazzini (eds.), Grosseto città vescovile; da Lo Stato di Siena antico e moderno (pt. V, cc. 33-192), Società Bibliografica Toscana
Andrea Zagli (2007), Breve storia di Grosseto, Pisa: Pacini Editore
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