[Sidenote: Question as to the nature of baronies.] It is universally agreed that the only baronies known for two centuries after the Conquest were incident to the tenure of land held immediately from the crown. There are, however, material difficulties in the way of rightly understanding their nature which ought not to be passed over, because the consideration of baronial tenures will best develop the formation of our parliamentary system. Two of our most eminent legal antiquaries, Selden and Madox, have entertained different opinions as to the characteristics and attributes of this tenure. [Sidenote: Theory of Selden;] According to the first, every tenant in chief by knight-service was an honorary or parliamentary baron by reason of his tenure. All these were summoned to the king's councils, and were peers of his court. Their baronies, or honours, as they were frequently called, consisted of a number of knight's fees; that is, of estates, from each of which the feudal service of a knight was due; not fixed to thirteen fees and a third, as has been erroneously conceived, but varying according to the extent of the barony and the reservation of service at the time of its creation. Were they more or fewer, however, their owner was equally a baron, and summoned to serve the king in parliament with his advice and judgment, as appears by many records and passages in history. But about the latter end of John's reign, some only of the most eminent tenants in chief were summoned by particular writs; the rest by one general summons through the sheriffs of their several counties. This is declared in the Great Charter of that prince, wherein he promises that, whenever an aid or scutage shall be required, faciemus summoneri archiepiscopos, episcopos, abbates, comites et majores barones regni sigillatim per literas nostras. Et præterea faciemus summoneri in generali per vicecomites et ballivos nostros omnes alios qui in capite tenent de nobis. Thus the barons are distinguished from other tenants in chief, as if the former name were only applicable to a particular number of the king's immediate vassals. But it is reasonable to think that, before this charter was made, it had been settled by the law of some other parliament, how these greater barons should be distinguished from the lesser tenants in chief; else what certainty could there be in an expression so general and indefinite? And this is likely to have proceeded from the pride with which the ancient and wealthy barons of the realm would regard those newly created by grants of escheated honours, or those decayed in estate, who yet were by their tenures on an equality with themselves. They procured therefore two innovations in their condition; first that these inferior barons should be summoned generally by the sheriff, instead of receiving their particular writs, which made an honorary distinction; and next, that they should pay