Africanus the elder left Spain in 206. After a provincial government of nine years (206-197), the country was divided into two provinces, separated by the IBERUS (Ebro), and each province was assigned to a praetor. It was some time, however, before Spain was really brought into a state of complete peace and order. The mountains and forests were a formidable obstacle to the Roman legions, and favored guerilla warfare, which makes conquest slow and laborious. The most warlike of the Spanish tribes was the CELTIBERI, who occupied the interior of the peninsula. They were always uncertain and intractable, continually breaking out into revolt. In 195, Cato the elder put down a rebellion led by them. He established more firmly the Roman power east of the Iberus. He disarmed the inhabitants of this part of Spain, and compelled all from the Pyrenees to the Guadalquivir to pull down their fortifications. Still the smouldering fires of rebellion were not extinguished, for, sixteen years later (179), we find TIBERIUS SEMPRONIUS GRACCHUS, the father of the famous Gracchi, as Governor of Spain, fighting the troublesome Celtiberi. He captured over one hundred of their towns, but tempered his victories with moderate measures, showing himself greater in peace than in war. He granted to the poorer classes lands on favorable conditions, and did much to produce contentment among the natives. But farther west, in the valleys of the Douro and Tagus, and in Lusitania (Portugal), there seems to have been constant warfare. In 154, MUMMIUS, the same who eight years later sacked Corinth, was Governor of Farther Spain. His defeat by the Lusitanians encouraged the Celtiberi to revolt again, and there followed another defeat, with a massacre of many Roman citizens. Two years later (152), CLAUDIUS MARCELLUS avenged these losses, founded Corduba, and governed the country humanely. His successors, LUCIUS LUCULLUS and SERVIUS GALBA, were so cruel and grasping as to drive the Lusitanians into another open rebellion, headed by VIRIATHUS, a bold and daring bandit. During seven years (147-140) he defeated again and again the armies sent against him. The Celtiberi joined his standards, and Spain seemed likely to slip from the Romans. The only check to these successes was during the command of METELLUS MACEDONICUS (143); when he was recalled, matters returned to their former condition. In 140, the Consul Mancinus was obliged to capitulate, and, to save himself and his army, made a treaty which the Senate refused to sanction. Viriathus was finally (139) assassinated by persons hired by the Consul Caepio; his people were then subdued, and the government was ably conducted (138) by DECIMUS JUNIUS BRUTUS. THE NUMANTINE WAR (143-133). The Celtiberi, however, were still in arms. The strong city of NUMANTIA, the capital of one of their tribes, witnessed more than one defeat of a Roman Consul before its walls (141-140). Finally Rome sent out her best general, Africanus the younger.