Many descriptions of royal abodes in Irish poems are evidently purely fanciful, but underneath the poetical adornments we can discern the features of the great wooden hall which appears to have been the residence of the tribal chieftain, whether Keltic, Norse, or Saxon, throughout the whole north of Europe in early times.[1040] The thousands of earthen rings, generally called _raths_, which are still scattered over Ireland, are believed to be the enclosures of these kings' or chieftains' homesteads. Were they intended for serious military defence? We are not in a position to answer this question categorically, but the plans of a number of them which we have examined do not suggest anything but a very slight fortification, sufficient to keep off wolves. At all events we never hear of these raths or duns standing a siege; the conquering raider comes, sees, and burns.[1041] We are therefore justified in concluding that they did not at all correspond to what we mean by a private castle. And most certainly the motte-castle, with its very small citadel, and its limited accommodation for the flocks and herds of a tribe, was utterly unsuited to the requirements of the tribal system. A good deal of light is thrown on the way in which Irish chieftains regarded private castles at the time of the invasion by the well-known story of one who refused a castle offered him by the invaders, saying that he preferred a castle of bones to a castle of stones. Whether legendary or not, it represents the natural feeling of a man who had been accustomed to sleep trustfully in the midst of men of his own blood, tied to him by the bonds of the clan. The clan system in Ireland undoubtedly led to great misery through the absence of a central authority to check the raids of one clan upon another; but though we occasionally hear of a chieftain being murdered "by his own," we have no reason to think that clan loyalty was not sufficient, as a rule, for the internal safety of the community. So that a popular chieftain might well refuse a fortification which had every mark of a hateful and suspicious invader.[1042]