the 4th century Ausonius in his Ordo Nobilium Urbium, notices Catania and Syracuse alone among the cities of Sicily. Middle Ages Catania was sacked by the Vandals of Gaiseric in 440–441. After a period under the Ostrogoths, it was reconquered in 535 by the Eastern Roman Empire, under which (aside from a short period in 550–555) it remained until the 9th century. It was the seat of the Byzantine governor of the island. Catania was under an Islamic emirate for two centuries, after which it fell to the Normans of Roger I of Sicily. Subsequently, the city was ruled by a bishop-count (1072). In 1194–1197 the city was sacked by German soldiers during after the conquest of the island by emperor Henry VI. In 1232 it rebelled to the former's son, Frederick II, who later built a massive castle, Castello Ursino and also made Catania a royal city, ending the dominance of the bishops. Catania was one of the main centers of the Sicilian Vespers revolt (1282) against the House of Anjou, and was the seat of the incoronation of the new Aragonese king of Sicily, Peter I. In the 14th century it gained importance as it was chosen by the Aragonese as a Parliament and Royal seat. Here, in 1347, it was signed the treaty of peace that ended the long War of the Vesper between Aragonese and Angevines. Catania lost its capital role when, in the early 15th century, Sicily was turned into a member of the Crown of Aragon, and kept its autonomy and original privileges specially during the period from 1282 to 1410. In 1434 King Alfonso V founded here the Siciliae Studium Generale, the oldest university in the island. Early modern times With the unification of Castile and Aragon (early 16th century), Sicily became part of the Spanish Empire. It rebelled against the foreign government in 1516 and 1647. In 1669 the city's surroundings suffered great material damage from the 1669 Etna eruption. The city itself was largely saved by its walls that diverted most of the lava into the port. Afterwards, in 1693 the city was nearly completely destroyed by a heavy 1693 Sicily earthquake and its aftershocks. The city was then rebuilt in the Baroque architecture that nowadays characterizes it. Unified Italy Catania was one of the vanguards of the movement for Sicilian autonomy in the early 19th century. In 1860 Giuseppe Garibaldi's