But much as he owed to the friendship of the sons of Aemilius, he owed it also to his own energy and cheerful vigour that these sixteen years of exile were not lost time in his life. He employed them, not in fruitless indulgence in homesickness, or in gloomy brooding over his wrongs, but in a careful and industrious study of the history and institutions of the people among whom he was compelled to reside[32]; in ingratiating himself with those members of the Senate who he thought might be useful to his countrymen; and in forming and maturing his judgment as to the course of policy they ought to pursue. Nor was he without means of gratifying lighter tastes. He was an active sportsman: and the boar-hunting in the district of Laurentum not only diverted his attention from the distressing circumstances of his exile, and kept his body in vigorous health, but obtained for him the acquaintance of many men of rank and influence. Thus for instance his intimacy with the Syrian prince Demetrius, afterwards king Demetrius Soter, was made in the hunting-field[33]: and the value which this young man attached to his advice and support is some measure of the opinion entertained generally of his wisdom, moderation, and good judgment. We have no further details of his life in Rome; but we have what is better,—its fruits, in the luminous account of its polity, the constitution of its army, and the aims of its statesmen. [Sidenote: B.C. 151. Release of the detenus.] At last the time came when he was once more free to visit his own country, or to extend his knowledge by visiting the countries which he wished to describe. After repeated applications to the Senate by embassies from Achaia, made without avail, in B.C. 151 Polybius appeared in person to plead the cause before the Fathers. There was now, it was thought, no reason for retaining these unfortunate men. The original thousand had shrunk to less than three hundred; middle-aged men had become in sixteen years old and decrepit; they had lost connexions and influence in the Peloponnese; they had learnt by bitter experience the impossibility of resisting the power of Rome, and were no longer likely to venture on organising any opposition. Their longer detention could only be a measure of vengeance, and useless vengeance. Still the debate in the Senate was long and doubtful, until it was brought to a conclusion by the contemptuous exclamation of Cato: “Are we to sit here all day discussing whether some old Greek dotards are to be buried by Italian or Achaean undertakers?” Polybius, elated by a concession thus ungraciously accorded, wished to enter the Senate once more with a further request for a restitution of their property in Achaia. But Cato bluntly bade him “remember Ulysses, who wanted to go back into the cave of the Cyclops to fetch his cap and belt.”[34] [Sidenote: Coss. L. Marcius Censornius, Manius Manilius, B.C. 149. Polybius sent for to Lilybaeum.]