Adamnan was more successful in his own country.

In 697 he visited Ireland, and took an important part in a legislative council held at Tara.

On this occasion he procured the enactment of a law, which was called the Canon of Adamnan, or the Law of the Innocents, and sometimes "the law not to kill women." We have already referred to the martial tendencies of the ladies of ancient Erinn--a tendency, however, which was by no means peculiar at that period of the world's history.

The propensity for military engagements was not confined to queens and princesses--women of all ranks usually followed their lords to the field of battle; but as the former are generally represented as having fallen victims to each other's prowess in the fight, it appears probable that they had their own separate line of battle, or perhaps fought out the field in a common _melee_ of feminine forces.
Had we not the abundant testimony of foreign writers to prove the influence and importance of the missions undertaken by Irish saints at this period of her history, it might be supposed that the statements of her annalists were tinged with that poetic fancy in which she has ever been so singularly prolific, and that they rather wrote of what might have been than of what was.

But the testimony of Venerable Bede (to go no further) is most ample on this subject.
Irish missionary zeal was inaugurated in the person of St.Columba, although its extension to continental Europe was commenced by another, who, from similarity of name, has been frequently confounded with the national apostle.
St.Columbanus was born about the year 539.