This drawing is similar to the west facade of the church of Saint-Maclou in Rouen, designed in the 1430s, but there is no evidence that it was the model for any particular building.

This huge drawing, on 12 large sheets of parchment, was produced by Maestre Carlín, an architect from Rouen, one of many northern European craftsmen to emigrate to the Iberian Peninsula in the 15th century. Bringing with him the new forms of French Flamboyant style, he was closely involved in designing portals for the cathedrals in Barcelona, Seville and other peninsular cities.

One of the earliest architectural sketches to survive, this work includes fanciful elements and raises questions about how these kinds of drawing were used.