site. The Lady of Elche (probably 4th century BC) possibly represents Tanit, but also shows Hellenistic influence, as do the 6th century Sphinx of Agost and Biche of Balazote. The Bulls of Guisando are the most impressive examples of verracos, which are large Celtiberian animal sculptures in stone; the 5th century BC Bull of Osuna is a more developed single example. Some decorated falcata, the distinctive curving Iberian sword, have survived, and large numbers of bronze statuettes used as votive offerings. The Romans gradually conquered all of Iberia between 218 BC and 19 AD. As elsewhere in the Western Empire, the Roman occupation largely overwhelmed native styles; Iberia was an important agricultural area for the Romans, and the elite acquired vast estates producing wheat, olives and wine, with some later emperors coming from the Iberian provinces; many huge villas have been excavated. The Aqueduct of Segovia, Roman Walls of Lugo, Alcántara Bridge (104–106 AD), and the Tower of Hercules lighthouse are among a number of well-preserved major monuments, impressive remains of Roman engineering if not always art. Roman temples survive fairly complete at Vic, Évora (now in Portugal), and Alcántara, as well as elements in Barcelona and Córdoba. There must have been local workshops producing the high-quality mosaics found, though most of the better free-standing sculpture was probably imported. The Missorium of Theodosius I is an important Late Antique silver dish that was found in Spain but was probably made in Constantinople. Early Medieval The Christianized Visigoths ruled Iberia after the collapse of the Empire, and the rich 7th century Treasure of Guarrazar, probably deposited to avoid looting in the Muslim Conquest of Spain, is now a unique survival of Christian votive crowns in gold; though Spanish in style, the form was probably then used by elites across Europe. Other Visigothic art in the form of metalwork, mostly jewellery and buckles, and stone reliefs, survives to give an idea of the culture of this originally barbarian Germanic people, who kept themselves very largely separate from their Iberian subjects, and whose rule crumbled when the Muslims arrived in 711. The jewelled crux gemmata Victory Cross, La Cava Bible and the Agate Casket of Oviedo are survivals from the 9-10th century of the rich Pre-Romanesque culture of the Asturias region in north-western Spain, which remained under Christian rule; the Santa María del Naranco banqueting house overlooking Oviedo, completed in 848 and later