Meanwhile, though the Three Orders of the Irish Saints had come to an end about the middle of the seventh century, they were succeeded by many great Churchmen, who combined with their ecclesiastical duties a lively interest in secular politics, in which they were wont to intervene, most commonly, no doubt, with beneficial effect, though occasionally with results nothing less than disastrous. One of the foremost, if not the very foremost, among the Irish clerics of this period was St. Adamnán, the reputed seer of the Vision which bears his name. This great prelate is a striking figure both in the ecclesiastical and secular history of his times; but the information we possess concerning him, though not altogether scanty, is not all of equal value. It consists partly of the evidences furnished by his own writings and contemporary records, partly of the further particulars which have been preserved in the annals compiled from the tenth to the twelfth centuries, though these, no doubt, are derived in great measure from earlier records. Adamnán was of high birth, as were many of the leading Irish Churchmen, the constitution of the National Church being thoroughly aristocratic, in accordance with the civil society upon which it was moulded. His father was Ronán, son of Tinne, a man of chiefly rank in the territory of Sereth, or Tír Aedha, now the barony of Tirhugh, in south-west Donegal, and the descendant of Conall Gulbán, the founder of a famous house, various branches of which ruled Tír Conaill from the fifth century until the fall of the O’Donnells at the beginning of the seventeenth century. Adamnán’s mother, Ronat by name, was of the Cinel Enda, a sept of West Meath.[3] The date of his birth is variously stated, but he appears to have been born between the years 624 and 627 at Drumhome, in Tír Aedha.[4] The name Adamnán is a diminutive of Adam, but through the tendency of Irish phonetics to elide the _d_ and _m_ in certain positions, it came to be written sometimes in the confusing forms Eunan and Onan, and has even been travestied into Theunan and Dennan. Adamnán entered the great monastery of Iona as a novice, probably about the year 650, as Segine (_ob._ 652) was then abbot. There he was distinguished for his devotion and learning, and in the year 679, soon after the death of Abbot Failbhe, was elected to succeed him, being ninth in descent from St. Colm Cille, the founder, to whom he was akin. Indeed, all Adamnán’s predecessors, and his successors for several generations, were members of the same great family. In the government of his house and of the ecclesiastical establishments in the neighbouring islands, he displayed the qualities of an able administrator, as well as those of saint and scholar; nor did he confine his activities to matters ecclesiastical, but, like most of the Irish saints, took an active part in public events.