This study addresses violent urban disturbances which occurred in England in the early 1980s with particular reference to the Bristol ‘riots’ of April 1980 and the numerous disorders which followed in July 1981. Revisiting two concepts traditionally utilised to explain the spread of collective violence, namely ‘diffusion’ and ‘contagion,’ it argues that the latter offers a more useful model for understanding the above-mentioned events. Diffusion used in this context implies that such disturbances are independent of each other and occur randomly. It is associated with the concept of ‘copycat riots’, which were commonly invoked by the national media as a way of explaining the spread of urban disturbances in July 1981. Contagion by contrast holds that urban disturbances are related to one another and involve a variety of communication processes and rational collective decision-making. This implies that such events can only be fully understood if they are studied in terms of their local dynamics. Providing the first comprehensive macro-historical analysis of the disturbances of July 1981, this thesis utilises a range of quantitative techniques to argue that the temporal and spatial spread of the unrest exhibited patterns of contagion. These mini-waves of disorder located in several conurbations were precipitated by major disturbances in inner-city multi-ethnic areas. This contradicts more conventional explanations which credit the national media as the sole driver of riotous behaviour. The thesis then proceeds to offer a micro analysis of disturbances in Bristol in April 1980, incorporating both qualitative and quantitative techniques. Exploiting previously unexplored primary sources and recently collected oral histories from participants, it establishes detailed narratives of three related disturbances in the city. The anatomy of the individual incidents and local contagious effects are examined using spatial mapping, social network and ethnographic analyses. The results suggest that previously ignored educational, sub-cultural and ethnographic intra- and inter-community linkages were important factors in the spread of the disorders in Bristol. The case studies of the Bristol disorders are then used to illuminate our understanding of the processes at work during the July 1981 disturbances. It is argued that the latter events were essentially characterised by anti-police and anti-racist collective violence, which marked a momentary recomposition of working-class youth across ethnic divides.

This thesis examines urban political conflict in the late Middle Ages (c. 1370-1440) in Europe’s most heavily urbanised regions, Italy and the Southern Low Countries. Conflicts have frequently been viewed in the context of an emerging state-controlled political order, and have been interpreted either as forms of disruptive disorder, or as affirmations of political processes shaped by states. This thesis suggests that urban conflict should be studied not in the context of a state-controlled political order, but within the political framework provided by the numerous semi-autonomous jurisdictional institutions inside and outside cities (such as guilds, parishes or contending outside powers). This pluralistic order of politics gave rise to a form of political order sui generis which expressed itself in two ways. According to a general logic of conflict (Part One), particular rationales for justifying conflict (Chapter One) and specific political practices ranging from concealed protest to urban warfare (Chapter Two) were embedded in this multi-faceted and shifting political framework. Action groups could be negotiated and renegotiated around the resources provided by the city’s multiple legitimating institutions (Chapter Three). At the same time, such political institutions were configured differently in different cities, and this also generated a particular logic which lay at the basis of different systems of conflict (Part Two). Levels of conflict could, in fact, vary greatly between Bologna and Liège (Chapter Four), Florence and Tournai (Chapter Five), and Lille and Verona (Chapter Six), where, on the basis of different underlying political institutions, diverse practices of conflict and forms of association prevailed. The pluralistic order of politics itself was, therefore, a form of political organisation which crystallised around conflict. It gave rise to a logic which put conflict at the centre of the political order of late medieval cities.