'312 erws are to be in the randir between clear and brake, wood and field, and wet and dry, except a supernumerary trev [the upland has in addition].'[258] In this case the 'tunc pound' of 240d. was paid by each trev of 4 randirs, each randir containing 312 erws, and the trev 1,248 erws in all. The _trev_ in South Wales is, therefore, slightly larger than the [p204] Venedotian _maenol_. Here we are bound by no law that the pence in the gwestva should exactly correspond with the number of erws. But in the other versions the 12 odd erws in the randir are stated to be for 'domicilia,'[259] or buildings, and 12 erws would allow of 3 tyddyns of the requisite 4 erws each. This fixes for us the number of homesteads or tyddyns in the trev. There were 3 tyddyns to each randir, and 4 randirs to the trev, and so there were 12 tyddyns in each trev, and to each tyddyn there were appendant 100 erws in the arable, pasture, and waste. «The trev a cluster of twelve holdings, each paying an ounce or score of silver, so between them the tunc pound.» The trev which paid its tunc pound of 240d. was thus made up of 12 holdings, each paying a score pence. And as in the Latin version of the Dimetian Laws (p. 825) a score pence is translated _uncia argenti_, the connexion is at once made clear between the system of grouping the holdings so as to pay the tunc pound, and the monetary system which prevailed in Wales, viz., that according to which 20d. made an ounce, and 12 ounces one pound. The 12 holdings each paying a score of pence, or ounce of silver, made up between them the tunc pound of the trev. «The tribal households shifted among the holdings.» This curious geometrical arrangement or classification of tyddyns and trevs, with an equal area of land to each, is at first sight entirely inconsistent with the division of the family land among the heirs of the holder, inasmuch as the great grandchildren when they divided the original family holding must, one would suppose, have held smaller shares than their great [p205] grandfather. And there is only one answer to this. It would have been so if the tribe, and the families composing it, were permanently fixed and settled on the same land, and pursuing a regular agriculture, with an increasing population within certain boundaries. But the Welsh were still a _pastoral_ people, and, as we shall see when we come to examine the Irish tribal system, while the homesteads and land divisions were fixed, the occupants were shifted about by the chiefs from time to time, each sept, or clan, or family receiving at each rearrangement a certain number of tyddyns or homesteads, according to certain tribal rules of blood relationship of a very intricate character.