many had been trained in mainland Italy and had returned with a more detailed understanding of the Baroque idiom. Their work inspired less-travelled Sicilian designers. Very importantly, these architects were also assisted by the books of engravings by Domenico de' Rossi, who for the first time wrote down text with his engravings, giving the precise dimensions and measurements of many of the principal Renaissance and Baroque façades in Rome. In this way, the Renaissance finally came late to Sicily by proxy. At this stage of its development, Sicilian Baroque still lacked the freedom of style that it was later to acquire. Giovanni Battista Vaccarini was the leading Sicilian architect during this period. He arrived on the island in 1730 bringing with him a fusion of the concepts of Bernini and Borromini, and introduced to the island's architecture a unified movement and a play of curves, which would have been unacceptable in Rome itself. However, his works are considered of lesser quality than those which were to come. Notable works which date from this period are the 18th century wings of the Palazzo Biscari at Catania and Vaccarini's Cattedrale di Sant'Agata, also in Catania. On this building Vaccarini quite clearly copied the capitals from Guarino Guarini's Architettura Civile. It is this frequent copying of established designs that causes the architecture from this period, while opulent, also to be disciplined and almost reined in. The style of Vaccarini, appointed City Architect in 1736, was to dominate Catania for the next decades. A second hindrance to Sicilian architects' fully achieving their potential earlier was that frequently they were only rebuilding a damaged structure, and as a consequence having to match their designs to what had been before, or remained. The Cathedral of San Giorgio at Modica (Illustration 10) is an example. It was badly damaged in an earthquake of 1613, rebuilt in 1643 in a Baroque style while keeping the medieval layout, then damaged again in 1693. Rebuilding again began in 1702, by an unknown architect; Rosario Gagliardi oversaw the façade's completion in 1760, There were also other influences at work at this time. Between 1718 and 1734 Sicily was ruled personally by Charles VI from Vienna, and as a result close ties with Austrian architecture can be perceived. Several buildings on the island are shameless imitations of the works of Fischer von Erlach, who had begun to rebuild Schönbrunn Palace in 1686