It is not a matter upon which we must dwell, but evidently the gavelkind tenure must have been something different from the prevalent tenures of other districts. The difference cannot have been the equal division of the sulungs and yokes between sons as contrasted with the single succession to the yardlands of other districts, because the sulungs and yokes were apparently not interfered with by the gavelkind division among heirs. And when the right of the youngest son under the custom of gavelkind to succeed to the parental hearth is compared with the similar right of the youngest son in the case of the Cymric gwely the inference becomes very strong that the gavelkind holdings were family holdings and the gavelkind divisions internal divisions within the family, like those of the Cymric gwely, not necessarily interfering with the permanence of the sulungs and yokes of the open-field system of which the family holdings were composed or in which the family had rights. The surveys of Kentish manors in the records of Battle Abbey and the ‘Black Book of St. Augustine’ present instances sometimes of sulungs and yokes held by the _heredes_ of a deceased person and sometimes of others which maintain their unity for purposes of payments and services although in the possession of several holders. The sulung in these cases seems to have continued to be the unit liable for the fixed ploughing and other services irrespective of the question who were its occupants.[324] Once more perhaps some light may be gained from Cymric tribal custom. [Sidenote: Analogy of the Cymric trefgordd.] We have learned from the Cymric evidence that a district might be divided for purposes of revenue and food rents into sub-districts, irrespective of who might be the occupants. And we have seen also how the Cymric trefgordd or unit of pastoral occupation, with its one plough and one churn and one herd of cattle under a single herdsman, could remain a permanent taxable unit paying the tunc pound in lieu of food rents, whoever might at the time be its occupants and have cattle in the herd. Within the lines of tribal custom itself the members of a Cymric gwely might be spread over a district and their cattle distributed among many trefgordds, while from the chieftain’s point of view the local units of taxation were uniform and regular. [Sidenote: But the yardlands were mostly holdings with single succession on payment of a relief to the lord.]