that are hardest to talk to; and, in § 44, Bangor in Co. Down is called unlucky or unfortunate, no doubt, as the gloss says, because of the repeated plunderings and destruction of its monastery by the Norse during the early part of the ninth century (A.D. 823, 824).
In endeavouring to trace the origin of the Triad as a form of literary composition among the Irish, one must remember that it is but one of several similar enumerative sayings common in Irish literature. Thus the collection here printed contains three duads (124. 133. 134), seven tetrads (223. 230. 234. 244. 248. 251. 252), and one heptad (235). A whole Irish law-book is composed in the form of heptads; while triads, tetrads, &c., occur in every part of the Laws. Such schematic arrangements were of course a great aid to memory.
 See Ancient Laws of Ireland, vol, v., pp. 118-373.
 Thus in the first volume of the Laws we find duads on p. 228, 15; 294, 27; triads on p. 50, 9. 27; 230, 4; 264, 20;