This article examines the architectural patronage of King Alfonso X and the notion of a ‘Court Style’ in thirteenth-century Gothic architecture. Following brief consideration of problems of evidence, I briefly sketch common characteristics of the architectural patronage of Alfonso’s royal rivals and allies across Europe and the Iberian Peninsula. This prompts reassessment of the king’s relationships with mendicant and Cistercian orders, and then detailed consideration of his financial contributions to the cathedrals of Toledo, Burgos and León. Although royal heraldry and imagery is prominent in all three cathedrals, I argue that Alfonso probably did not play a significant role in promoting rayonnant architecture in his kingdom. The most dis...