It might be thought that the general expectation of the end of the world in the year 1000, which prevailed towards the end of the 10th century, had something to do with the spread of these wooden castles, as it might have seemed scarcely worth while to build costly structures of stone. But it is not necessary to resort to this hypothesis, because there is quite sufficient evidence to show that long before this forecast of doom was accepted, wood was a very common, if not the commonest, material used in fortification. The reader has only to open his Cæsar to see how familiar wooden towers and wooden palisades were to the Romans; and he has only to study carefully the chronicles of the 9th, 10th, 11th, and 12th centuries to see how all-prevalent this mode of fortification continued to be. The general adoption of the feudal system must have brought about a demand for cheap castles, which was excellently met by the motte with its wooden keep and its stockaded bailey. M. Enlart has pointed out that wooden defences have one important advantage over stone ones, their greater cohesion, which enabled them to resist the blows of the battering-ram better than rubble masonry.[204] Their great disadvantage was their liability to fire; but this was obviated, as in the time of the Romans, by spreading wet hides over the outsides. Stone castles were still built, where money and means were available, as we see from Fulk Nerra’s keep at Langeais; but the devastations of the Northmen had decimated the population of Gaul; labour must have been dear, and skilled masons hard to find. In these social and economic reasons we have sufficient cause for the rapid spread of wooden castles in France.
The sum of the evidence which we have been reviewing is this: the earliest mottes which we know of were probably built by Thibault-le-Tricheur about the middle of the 10th century. But in the present state of our knowledge we must leave the question of the time and place of their first origin open. The only thing about which we can be certain is that they were the product of feudalism, and cannot have arisen till it had taken root; that is to say, not earlier than the 10th century.
[CHAPTER VI]
DISTRIBUTION AND CHARACTERISTICS OF MOTTE-CASTLES
The motte-and-bailey type of castle is to be found throughout feudal Europe, but is probably more prevalent in France and the British Isles than anywhere else. We say probably, because there are as yet no statistics prepared on which to base a comparison.[205] How recent the inquiry into this subject is may be learned from the fact that Krieg von Hochfelden, writing in 1859, denied the existence of mottes in Germany;[206] and even Cohausen in 1898 threw doubt upon them,[207] although General Köhler in 1887 had already declared that “the researches of recent years have shown that the motte was spread over the whole of Germany, and was in use even in the 13th and 14th centuries.”[208] The greater number of the castles described by Piper in his work on Austrian castles are on the motte-and-bailey plan, though the motte in those mountainous provinces is generally of natural rock, isolated either by nature or art. Mottes were not uncommon in Italy, according to Muratori,[209] and are especially frequent in Calabria, where we may strongly suspect that they were introduced by the Norman conqueror, Robert Guiscard.[210] It is not improbable that the Franks of the first crusade planted in Palestine the type of castle to which they were accustomed at home, for several of the excellent plans in Rey’s Architecture des Croisés show clearly enough the motte-and-bailey plan.[211] In most of these cases the motte was a natural rock.
On the other hand, we are told by Köhler that motte-castles are not found among the Slavonic nations, because they never adopted the feudal system.[212] Nor are there any in Norway or Sweden.[213] Denmark has some, which are attributed by Dr Sophus Müller to the mediæval period.[214]
Of course whenever a motte was thrown up, the first castle upon it must have been a wooden one. A stone keep could not be placed on loose soil.[215] The motte, therefore, must always represent the oldest castle. But there is no reason to think that the motte and its wooden keep were merely temporary expedients, intended always to be replaced as soon as possible by stone buildings. Even after stone castles had been fully developed, wood continued to hold its ground as a solid building material until a very late period.[216] And mottes were used not only throughout the 11th and 12th centuries, but even as late as the 13th. King John built many castles of this type in Ireland; and as late as 1242 Henry III. ordered a motte and wooden castle to be built in the island of Rhé.[217] Muratori gives a much later instance: in 1320 Can Grande caused a great motte to be built near Pavia, and surrounded with a ditch and hedge, in order to build a castle on it.[218] And as will be seen in the next chapter, there is considerable evidence that many mottes in England which were set up in the reign of William I., retained their wooden towers or stockades even till as late as the reign of Edward I. The motte at Drogheda held out some time against Cromwell, and is spoken of by him as a very strong place, having a good graft (ditch) and strongly palisaded.[219] Tickhill Castle in Yorkshire had a palisade on the counterscarp of the ditch when it was taken by Cromwell.[220]
The position of these motte-castles is wholly different from that of prehistoric fortresses. They are almost invariably placed in the arable country, and as a rule not in isolated situations, but in the immediate neighbourhood of towns or villages. It is rare indeed to find a motte-castle in a wild, mountainous situation in England. The only instance which occurs to the writer is that of the motte on the top of the Hereford Beacon; but there is great probability that this was a post fortified by the Bishop of Hereford in the 13th century to protect his game from the Earl of Gloucester. Nothing pointing to a prehistoric origin was found in this motte when it was excavated by Mr Hilton Price,[221] though the camp in which it is placed is supposed to be prehistoric.
The great majority of mottes in England are planted either on or near Roman or other ancient roads, or on navigable rivers.[222] It was essential to the Norman settlers that they should be near some road which would help them to visit their other estates, which William had been so careful to scatter, and would also enable them to revisit from time to time their estates in Normandy.[223] The rivers of England were much fuller of water in mediæval times than they are now, and were much more extensively used for traffic; they were real waterways. When we find a motte perched on a river which is not navigable, the purpose probably was to defend some ford, or to exact tolls from passengers. Thus the Ferry Hill (corrupted into Fairy Hill) at Whitwood stands at the spot where the direct road from Pontefract to Leeds would cross the Calder. It was probably not usual for the motte to be dependent on a stream or a spring for its supply of water, and this is another point in which the mediæval castle differs markedly from the prehistoric camp; wells have been found in a number of mottes which have been excavated, and it is probable that this was the general plan, though we have not sufficient statistics on this subject as yet.[224]