The reign of Augustus (27 BC - 14 AD) began a long period known as the Pax Romana, or Roman peace. Despite continuous wars on the frontiers, and one year-long civil war over the imperial succession, the Mediterranean world remained at peace for more than two centuries. Augustus enlarged the empire dramatically, annexing Egypt, Dalmatia, Pannonia, and Raetia, expanded possessions in Africa, and completed the conquest of Hispania. By the end of his reign, the armies of Augustus had conquered the Alpine regions of Raetia and Noricum (modern Switzerland, Bavaria, Austria, Slovenia), Illyricum and Pannonia (modern Albania, Croatia, Hungary, Serbia, etc.). The Romans and their armies occupied a narrow strip of the right bank of the Danube and a very small part of south-western Slovakia (Celemantia, Gerulata, Devín Castle). Augustus's successor Tiberius (14 AD - 37 AD) wanted to conquer all Germania up to the Elbe river and in 6 AD started a military expedition from the fort of Carnuntum to Mušov and beyond. However, he was forced to abandon the conquest because of a revolt in Pannonia. The expanding Roman Empire established and maintained a series of outposts around and just north of the Danube. The largest of these were Carnuntum, whose remains are on the main road halfway between Vienna and Bratislava, and Brigetio (present-day Szőny at the Slovak-Hungarian border). The Romans supported the client kingdom of the Quadi, a Germanic tribe, to maintain peace in the Middle Danube area. The Marcomanni were another Germanic tribe said by Tacitus to "stand first in strength and renown". Maroboduus, who ruled in the first quarter of the first century AD, was a powerful ruler with an extensive empire based on modern-day Bohemia that included many smaller tribes. He was fully independent of Rome. Later the Marcomanni also became clients of the Romans. The Romans built forts in the province of Pannonia, bordering on Marcomannic territory, in the earlier Flavian period (69 AD - 96 AD). These included Arrabona and Brigetio in modern Hungary. They built various military installations in the Middle Danube area at the end of the first century including the fort of Gerulata. This fort, rebuilt several times before the end of the fourth century, is still visible in the village of Rusovce in southern Bratislava. Marcomannic Wars Germanic attacks, 166–171 Pannonia was invaded in late 166 or early 167 by a force of 6,000 Langobardi and Ubii.