Oviedo in Spain are several churches of the late 9th and early 10th century which display a remarkable array of windows containing the earliest examples of roses windows outside the Byzantine Empire. The designs closely resemble the motifs found on the Byzantine relief carvings of marble sarcophagi, pulpits and well heads and pierced decorations of screens and windows of Ravenna and Constantinople. The church of San Pedro has a rectangular window with a pierced decoration of two overlapping circles, the upper containing a Greek Cross, the window being divided by the circles and the arms of the cross into numerous sections like tracery “lights”. In another of these churches, San Miguel de Lillo, is the earliest known example of an axially placed oculus with tracery. Several such windows of different sizes exist, and decoration of both Greek Cross and scalloped petal-like form occur, prefiguring both wheel and rose windows. Romanesque Circular windows Circular windows and decorative circular recesses are a feature of many Romanesque churches and cathedrals, particularly in Germany and Italy where the style existed for a prolonged period, overlapping the development of Gothic in France and its arrival with French architects in England. In Germany, Worms Cathedral, has wheel windows in the pedimental ends of its nave and gables, very similar to the Early Christian Basilica of S. Agnese in Rome. The apsidal western end has a central wheel window with smaller oculi in each face. The Church of the Apostles, Cologne has an array of both ocular and lobed windows forming decorative features in the gables and beneath the Rhenish helm spire. The octagonal dome has a ring of oculi with two in each of the curved faces. In Trebic, Czech Republic, is the 12th- and 13th-century Romanesque style Basilica of St Procopius with apsidal windows similar to those at Worms, but in this case the openings are filled with tracery of a Gothic form, clearly marking the transition to a new style. In Italy, the use of circular motifs in various media was a feature of church facades, occurring on Early Christian, Romanesque, Gothic, Renaissance and Baroque churches, a well-known example being those great circles in polychrome marble which complement the central circular window on Alberti's Early Renaissance façade at Santa Maria Novella in Florence. Oculi were also typically used in the drums supporting domes and as upper lights in octagonal baptisteries such as that at