The Cathedral of Leon, like its sister predecessor, Burgos Cathedral, follows the layout of the Rheims Cathedral (although at a reduced scale). Like most French cathedrals, the one of Leon is built with a geometric module based on the triangle (ad triangulum), the primary lines of which relate to the square root of 3, and to which respond all of the parts and the whole. This aspect, as with the layout, the elevations, and the decorative and symbolic repertoires, makes this cathedral an authentic trans-Pyrenee building, removed from Hispanic fashion and belonging to the purest school of French Champagne. This has earned it the epithets of being "the most French of Spanish cathedrals" or the Pulchra Leonina (the Beauty of Leon), since its formal features are related to the Gothic style of Champagne.

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