can be said to have had a protohistorical period, when, in prehistory, the literate cultures of Greece and Rome began to take notice of it, and a further proto-literate period of oghamepigraphy, before the early historical period began in the 5th century. Attempts have been made to reconstruct the political developments of this period by reference to early medieval Irish genealogical texts.
Ireland in Classical literature
Early references
Classical writers occasionally refer to Ireland under a variety of names, but these references contain little reliable information. For example, Diodorus Siculus claims that the Prettanoi of the island of Iris eat human flesh. Strabo, who calls the island Ierne, repeats the accusation, adding that they consider it honourable to eat their dead fathers, and openly have sex with their mothers and sisters. Pomponius Mela calls it Iuverna and says that, although the climate is unfavourable for grain, grass grows so richly that cattle burst if unrestrained from eating it. Julius Caesar, in his Commentarii de Bello Gallico, is the first to call the island Hibernia, describes it as about half the size of Britain, and correctly places it to the west of Britain – unlike Strabo, who places it to the north.
Tacitus
says that his father-in-law Gnaeus Julius Agricola, while governor of Britain, considered conquering Ireland, believing it could be held with one legion plus auxiliaries, and entertained an exiled Irish petty king with the intention of making him the pretext for conquest. Parallels have been drawn with the Irish legend of Túathal Techtmar, who is said to have been exiled to Britain as a child and returned with an army to claim the kingship of Tara in the 1st century. Tacitus also says that most of the harbours and approaches to Ireland were known through commerce, but inaccurately locates the island between Britain and the Iberian peninsula.
The 2nd-century poet Juvenal, in his second Satire, contrasting the victories of the Roman army with the low morals of the people at home in Rome, says that, as well as conquering Britain and the Orkney islands, "we have advanced arms beyond the shores of Iuverna". Although Juvenal is not writing history, it is possible that he is referring to a genuine Roman military expedition to Ireland.
The 2nd-century Alexandrian Greek writer Ptolemy, one of the most important geographers, mathematicians and astronomers in the ancient world, refers to Ireland in two of his works. In the astronomical treatise known as the Almagest he gives the latitudes of an island he calls Mikra Brettania or "Little Britain". In his Geography, at the same latitudes, he places the Prettanic island Iwernia, next to its neighbour, the Prettanic island Albion. The Geography contains the most detailed account of Ireland in classical literature, giving the latitude and longitude of six promontories, fifteen river mouths, ten settlements and nine islands, and naming sixteen population groups.
Peoples of Ireland according to Ptolemy's Geography.
North coast
Ptolemy describes the northern coast of Ireland, from the Northern Promontory in the west, to the Wenniknion promontory, the mouth of the riverWidwa, the mouth of the river Argita and the Rhobogdion promontory in the east. The peoples who inhabit the north coast are the Wenniknioi in the west and the Rhobogdioi in the east.
West coast
The west coast is poorly represented compared to the other three, and identification of the names Ptolemy gives is speculative. He begins with the Northern Promontory, and working north to south names the river Rhawiu ; the townMagnata ; the mouth of the rivers Libniu, AusobaSenu, Dur and Iernu, and the Southern Promontory. Peoples of this coast are: the Erdinoi near Donegal Bay; the Magnatai or Nagnatai of County Mayo and Sligo; the Auteinoi between County Galway and the Shannon, identifiable with the early medieval Uaithni; the Ganganoi, also known in north Wales, and the Wellaboroi in the far south-west.
South coast
The south coast stretches from the Southern Promontory to the mouths of the rivers Dabrona and Birgu and the Sacred Promontory. Peoples of the south coast are the Iwernoi in the west, who share their name with the island, Iwernia, and can be identified with the early medieval Érainn; the Usdiai, and the Brigantes in the east, who share their name with a people of Roman Britain.
East coast
From the Sacred Promontory in the south to the Rhobogdion promontory in the north, Ptolemy names the river Modonnu, the town of Manapia, the river Oboka, the town of Eblana, the river Buwinda, the promontory Isamnion, the river Winderios, and the river Logia. Peoples named, from south to north, are: the Koriondoi; the Manapioi, possibly related to the Menapii of Gaul; the Kaukoi, probably not related to the Germanic Chauci of the Low Countries; the Eblanoi; the Woluntioi, identifiable with the early medieval Ulaid; and the Darinoi.
Later references
Roman sources mention raids on Britain by Saxons of north-west Germany, by Picts from Scotland and by two groups of people usually associated with Ireland, the Scotti and the Atacotti. The origins and meanings of Scotti and Atacotti is uncertain. Atacotti disappears with the Romans. Scotti means Gaels to Adomnán in the late seventh century, but not to Columbanus in the early sixth century, who uses the older term Iberi instead. The Scotti are perhaps a confederation of tribes in Ulster, and the Atacotti one in Leinster, but this is not certain.
