The spread of Christianity, and the new modes of thought and action which obtained thereby, necessitated the reconstruction of ancient jurisprudence in lands as widely distant geographically, and as entirely separated politically, as Italy and Ireland. Those who have studied the subject most carefully, and who are therefore most competent to give an opinion, accept the popular account of the revision of our laws. The Four Masters thus record this important event:--"The age of Christ 438. The tenth year of Laeghairé. The Feinchus of Ireland were purified and written, the writings and old works of Ireland having been collected [and brought] to one place at the request of St. Patrick. Those were the nine supporting props by whom this was done: Laeghairé, i.e., King of Ireland, Corc, and Daire, the three kings; Patrick, Benen, and Cairneach, the three saints; Ross, Dubhthach, and Fearghus, the three antiquaries." Dr. O'Donovan, in his note, shelters himself under an extract from Petrie's _Tara;_ but it is to be supposed that he coincides in the opinion of that gentleman. Dr. Petrie thinks that "little doubt can be entertained that such a work was compiled within a short period after the introduction of Christianity in the country, and that St. Patrick may have laid the foundations of it;"[153] though he gives no satisfactory reason why that saint should not have assisted at the compilation, and why the statements of our annalists should be refused on this subject, when they are accepted on others. A list of the "family" [household] of Patrick is given immediately after, which Dr. O'Donovan has taken great pains to verify, and with which he appears satisfied. If the one statement is true, why should the other be false? Mr. O'Curry, whose opinion on such subjects is admittedly worthy of the highest consideration, expresses himself strongly in favour of receiving the statements of our annalists, and thinks that both Dr. Petrie and Dr. Lanigan are mistaken in supposing that the compilation was not effected by those to whom it has been attributed. As to the antiquity of these laws, he observes that Cormac Mac Cullinan quotes passages from them in his Glossary, which was written not later than the ninth century, and then the language of the Seanchus[154] Mor was so ancient that it had become obsolete. To these laws, he well observes, the language of Moore, on the MSS. in the Royal Irish Academy, may be applied: "They were not written by a foolish people, nor for any foolish purpose;" and these were the "laws and institutions which regulated the political and social system of a people the most remarkable in Europe, from a period almost lost in the dark mazes of antiquity, down to about within two hundred years of our own time, and whose spirit and traditions influence the feelings and actions of the native Irish even to this day."[155]