Conçue comme une enquête sur les élites rurales, cette thèse vise à restituer les étapes permettant au notable rural, un idéal-type social, de s'imposer dans un territoire donné. Le contado florentin est un cas paradigmatique. Les mobilités sociales et I'inurbamento des ruraux aisés sont vus comme les facteurs d'affaiblissement de communautés rurales livrées aux appétits citadins. La recherche mobilise le fonds de trois abbayes vallombrosaines, Montescalari, la Vallombreuse (Coltibuono, en se concentrant sur le quart Sud-Est du contado florentin (fonds Diplomatico de l'Archivio di Stato d Flo rence). La reconstitution de trajectoires familiale s'oblige à replacer ces trajectoires dans l' évolution plus large de logiques de la distinction sociale . Les éléments qui fondent la sociabilité rurale se transforment radicalement. Une société organisée à l'échelle locale, et très hiérarchisée dans le cadre seigneurial, fonctionne, jusqu'aux premières décennies du XIIIè siècle, sur l' exploitation de la terre et des hommes et sur la redistribution des bénéfices de la rente foncière entre un grand nombre de familles. Ce sont moins les profits du commerce et de l'artisanat rural qui font évoluer cette situation que l' intégration des patrimoines seigneuriaux aux dynamiques économiques de la ville. Le crédit fonctionne alors au dépens des anciennes solidarités pour devenir un facteur de différenciation sociale. Au même moment, on observe un transformation des cercles à l ' intérieur desquels se conservent et se transmettent les capitaux symboliques et matériels : la famille et ses prolongements; les seigneuries rurales ; les communes rurales et les clientèles de la haute aristocratie. / This thesis is an investigation into rural elites. It aims to evidence the process by which rural notables, considered here as a social type, establish their ascendency over a given territory. The Florentine contado is a case in point. Social mobility and the move of the wealthiest inhabitants of the country to the city are shown as primarily responsible for undermining the social cohesion of rural communities, increasingly preyed upon by townsmen. This research is based on three monastic archives, Montescalari, Vallombrosa and Coltibuono, and focuses on the Upper Valdarno valley and the Chianti hills (the archives are held by the Archivio di Stato of Florence, in the Diplomatico). Reconstructing the history and careers of the local notability provides a wider understanding of the way in which social distinction works and evolves over time, transforming rural communities and traditional rural sociability. From the early 12th century up to the first decades of the 13th century, rural communities in the contado were organized on a local and feudal basis, around a significant number of landowning families who exploited the land and the men who worked it, and organized the redistribution of the rent. That pattern changed, not so much because of the rise of city merchants and artisans, but because landlords started to use their lands and feudal power as a means to gain ground in the new urban economy. They neglected older rural solidarities to become providers of credit, which soon worked as an important factor of social differenciation. The social structures (the extended family, fiefdoms, rural towns and the nobility's clientele) which had been the traditional framework for keeping and transmitting capital (both economic and symbolic), were radically transformed in the process.

Before the publication of David Hockney’s book Secret Knowledge: rediscovering the lost techniques of the Old Masters in 2001, it was commonly believed that the first artist to use an optical aid in painting was the seventeenth-century Dutch painter Johannes Vermeer. Hockney, however, believes that the use of projected images started much earlier, as early as the fifteenth-century, claiming that evidence can be found in the work of the Flemish painter Jan van Eyck. Without rejecting Hockney’s pioneering work in this field, I nevertheless make the perhaps bolder claim that Italian artists were using the aid of image projections even before the time of Jan van Eyck, that is, as early as 1270. Although much of the information required to make an earlier claim for the use of optics can be found in Hockney’s publication, the key to linking all the information together has been missing. It is my unique contention that this key is a letter that has always been believed to have been European in origin. More commonly referred to as Roger Bacon’s Letter I show in detail how this letter was, in fact, not written by Roger Bacon, but addressed to him, and that this letter originated in China. Chinese knowledge about projected images, that is the concept that light-pictures could be received onto appropriate supports, came directly to Europe around 1250. This knowledge was expanded upon by Roger Bacon in his Opus Majus, a document which arrived in Italy in 1268 for the special consideration of Pope Clement IV. The medieval Italian painter Cimabue was able to benefit directly from this information about optical systems, when he himself was in Rome in 1272. He immediately began to copy optical projections, which stimulated the creation of a new, more individualistic, mode of representation in Italian painting from this time forward. The notion that projected images greatly contributed towards the development of naturalism in medieval Italian painting replaces the previously weak supposition that the stimulation was classical or humanist theory, and shows that it was, in fact, far likely something more technical as well. / Art History / D.Litt. et Phil. (Art History)

Before the publication of David Hockney’s book Secret Knowledge: rediscovering the lost techniques of the Old Masters in 2001, it was commonly believed that the first artist to use an optical aid in painting was the seventeenth-century Dutch painter Johannes Vermeer. Hockney, however, believes that the use of projected images started much earlier, as early as the fifteenth-century, claiming that evidence can be found in the work of the Flemish painter Jan van Eyck. Without rejecting Hockney’s pioneering work in this field, I nevertheless make the perhaps bolder claim that Italian artists were using the aid of image projections even before the time of Jan van Eyck, that is, as early as 1270. Although much of the information required to make an earlier claim for the use of optics can be found in Hockney’s publication, the key to linking all the information together has been missing. It is my unique contention that this key is a letter that has always been believed to have been European in origin. More commonly referred to as Roger Bacon’s Letter I show in detail how this letter was, in fact, not written by Roger Bacon, but addressed to him, and that this letter originated in China. Chinese knowledge about projected images, that is the concept that light-pictures could be received onto appropriate supports, came directly to Europe around 1250. This knowledge was expanded upon by Roger Bacon in his Opus Majus, a document which arrived in Italy in 1268 for the special consideration of Pope Clement IV. The medieval Italian painter Cimabue was able to benefit directly from this information about optical systems, when he himself was in Rome in 1272. He immediately began to copy optical projections, which stimulated the creation of a new, more individualistic, mode of representation in Italian painting from this time forward. The notion that projected images greatly contributed towards the development of naturalism in medieval Italian painting replaces the previously weak supposition that the stimulation was classical or humanist theory, and shows that it was, in fact, far likely something more technical as well. / Art History / D.Litt. et Phil. (Art History)