Ancient writers ascribed Rome's political difficulties during the last century of theRepublic to failures of character, specifically to ambitio, avaritia, luxuria, and libido. Sallust gives the clearest and best known account in the introductions to his monographs on Catiline and Jugurtha. The danger of decline had already been noticed by Polybius, and he indicated one point for the beginning of the process: the destruction of Carthage in 146 B.C. (6.57; 38.21 f.). No longer confronted by the external threat, Romans could relax and give themselves up instead to greed, luxury, and personal ambition. Livy seems to have accepted the same turning point: the first fifty books were devoted to the expansion of Rome down to the destruction of Carthage; those that followed paid more attention to Rome's internal problems. At the same time, Livy was not unaware of the importance of Cn. Manlius Vulso's campaigns in the east and his return in 187 B.C. laden with the spoils which marked the beginning of foreign luxury, including such unmentionable instruments of corruption as pedestal tables and sideboards (39.6, 7).