Ulster was known in ancient times as one of the five Irish 'kingdoms,' and remained unconquered by the English till the reign of James I., when the last prince of the great house of O'Neill, then Earl of Tyrone, fled to the Continent in company with O'Donel, Earl of Tyrconnel, head of another very ancient sept. Up to that period the men of Ulster proudly regarded themselves as 'Irish of the Irish and Catholic of the Catholics.' The inhabitants were of mixed blood, but, as in the other provinces of the island, the great mass of the people, as well as the ruling classes, were of Celtic origin. Those whom ethnologists still recognise as aborigines, in parts of Connaught and in some mountainous regions, an inferior race, are said to be the descendants of the Firbolgs, or Belgae, who formed the third immigration. They were followed and subdued by the Tuatha de Danans--men famed for their gigantic power and supernatural skill--a race of demigods, who still live in the national superstitions. The last of the ancient invasions was by the Gael or Celt, known as the Milesians and Scoti. The institutions and customs of this people were established over the whole island, and were so deeply rooted in the soil that their remnants to this day present the greatest obstacles to the settlement of the land question according to the English model, and on the principles of political economy, which run directly counter to Irish instincts. It is truly wonderful how distinctly the present descendants of this race preserve the leading features of their primitive character. In France and England the Celtic character was moulded by the power and discipline of the Roman Empire. To Ireland this modifying influence never extended; and we find the Ulster chiefs who fought for their territories with English viceroys 280 years ago very little different from the men who followed Brennus to the sack of Home, and encountered the legions of Julius Cæsar on the plains of Gaul.