craftsmen trained in Muslim styles, remained in Spain, and Mudéjar is the term for work in art and architecture produced by such people. The Mudéjar Architecture of Aragon is recognised as a UNESCO World Heritage Site, and the 14th century Patio de las Doncellas built for Peter of Castile in the Alcázar of Seville is another outstanding example. The style could harmonize well with Christian European medieval and Renaissance styles, for example in elaborate wood and stucco ceilings, and Mudéjar work often continued to be produced for some centuries after an area passed to Christian rule. Painting Romanesque In Spain, the art of the Romanesque period represented a smooth transition from the preceding Pre-Romanesque and Mozarabic styles. Many of the best surviving Romanesque church frescos that were at the time found all over Europe come from Catalonia with good examples in the churches of the Vall de Boí area; many of these were only uncovered during the 20th Century. Some of the best examples have been moved to museums, especially the Museu Nacional d’Art de Catalunya in Barcelona, which has the famous Central Apse from Sant Climent in Taüll and the frescos from Sigena. The finest examples of Castillian Romanesque frescoes are considered to be those in the San Isidoro in Leon, the paintings from San Baudelio de Berlanga, now mostly in various museums including the Metropolitan Museum of Art in New York, and those from Santa Cruz de Maderuelo in Segovia. There are also a number of altar frontals painted on wood and other early panel paintings. Gothic The Gothic art of Spain represented a gradual development from previous Romanesque styles, being led by external models, first from France, and then later from Italy. Another distinctive aspect was the incorporation of Mudejar elements. Eventually the Italian influence, which transmitted Byzantine stylistic techniques and iconography, entirely displaced the initial Franco-Gothic style Catalonia continued to be a prosperous area which has left many fine altarpieces; however the region went into decline after the emphasis of trade moved to the Atlantic after the American colonies opened up, which partly accounts for so many medieval survivals there, as there was not the money for Renaissance and Baroque renovations to churches. Early Renaissance Due to important economic and political links between Spain and Flanders from the mid-15th century onwards, the early Renaissance in Spain was heavily influenced by Netherlandish painting, leading to the identification