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Starting in Spain in the twelfth century, parliaments gradually spread over the Latin West. The paper quantifies the activity of medieval and early-modern parliaments, which also makes it possible to analyse the influence of this institutional innovation. In the early-modern period parliaments declined in influence in southern and central Europe and gained in importance in the Netherlands and Britain. From the sixteenth century onwards active parliaments, which function as constraints on the executive, had a positive effect on city growth and appear to have been instrumental in stabilizing the currency. Active pre-1800 parliaments also enhanced the quality of democratic institutions in the nineteenth and early twentieth century.

On the basis of a large (new) dataset of cities in Europe, North Africa and the Middle East in the millennium between 800 and 1800, we try to provide an answer to the question why, during this millennium, the urban center of gravity moved from Iraq (or more generally the Arab world) to Western Europe and to the shores of the Atlantic (during the 17th and 18th century) in particular. We study the characteristics of the European and Arab urban systems involved, amongst others focusing on the interaction between cities, and explain why one system was much more dynamic in the long run than the other. Also we assess the importance of various geographical, religious and institutional factors as the driving forces of urban expansion. Overall, we provide a better understanding of the dynamics of urban growth in the centuries leading up to the Industrial Revolution and an answer to the question why London, an economic backwater in 800, was able to overtake Baghdad, in 800 the thriving capital of the Abbasid caliphate, as the largest city in this part of the world.