The patrician, of course, had a larger homestead, at least "four yokes" in the earlier stages; later seven; later still twenty-five.[23] But the patricians were "a class of occupying landholders rather than proprietary landowners."[24] The "public land" was literally so, save in so far as the patricians would have the ampler (and often untaxed or low-rented) use of it for their much larger herds;[25] or, it may be, for cultivation by their clients or slaves. _Heredia_, however, were saleable, and herein lay one usual path to the dispossession and enslavement of freemen; while at all stages there went on that pressure of population on means of subsistence which underlies all economic history. Thus far, however, mere conquest has done less to impoverish and enslave the mass than the economic process is to do later. The conquerors, probably highland herdsmen to begin with, take estates for themselves, but leave the mass of the conquered in possession or use of land for which they pay tribute, and upon which they can independently live.[26] And thus far they live mainly as small pastoral farmers.[27] Trade and artisanship were for long but slightly developed, and were mainly in the hands of slaves, dependent "clients," or foreigners; and artisans and aliens were not admitted into the legions.[28] The ruling caste occupied, potentially[29] if not constantly, the city proper, the two or three fortified hills[30] on which at this stage it stands. They were certainly not the founders. The Palatine and the Quirinal hills had been occupied by Latins and Sabines respectively long before the time traditionally assigned to the "founding" of Rome; and there were communities there before them. Modern excavators trace many successive strata of civilisation before that which we call the Roman; and the probability is that the Romans of history, like the kindred Sabines, conquered a previous city "aristocracy" of kindred race, whose place and possessions they took. The previous inhabitants had presumably grown weak for self-defence by reason of some such disintegrating economic evolution as was soon to affect the conquerors themselves. Such a disintegration may well have taken place in the case of Alba Longa, of which the prior supremacy seems entirely credible.[31] But before Alba Longa there had been a civilisation[32] on the Roman hills which perhaps outwent in economic evolution anything attained in the Roman period until the last century of the Republic.