This is fascinating. I'm reading the English translation of the Lebor Gabala, and in it, it tells what languages were being taught at the tower of Nemrod (Tower of Babel), and who it was that came to Ireland that mastered those languages:
§11. Baath, [one of the two sons of Ibath] s. Gomer s. Iafeth, of him are the Gaedil and the people of Scythia. He had a son, the noble eminent man whose name was Feinus Farsaid. [It is he who was one of the seventy-two chieftains who went for the building of Nemrod's Tower, whence the languages were dispersed.] Howbeit, Nemrod himself was son of Cush s. Ham s. Noe. This is that Feinius aforesaid who brought the People's Speech from the Tower: and it is he who had the great school, learning the multiplicity of languages.
§12. Now Feinius had two sons: Nenual, [one of the two] whom he left in the princedom of Scythia behind him; Nel, the other son, at the Tower was he born. Now he was a master of all the languages; wherefore one came [to summon him] from pharao, in order to learn the multiplicity of languages from him. But Feinius came out of Asia to Scythia, whence he had gone for the building of the Tower; so that he died in the princedom of Scythia, at the end of forty years, and passed on the chieftainship to his son, Nenual.
§14. Now that is the time when Gaedel Glas, [from whom are the Gaedil] was born, of Scota d. Pharao. From her are the Scots named, ut dictum est
Feni are named from Feinius
a meaning without secretiveness:
Gaedil from comely Gaedel Glas,
Scots from Scota.
§15. It is Gaedel Glas who fashioned the Gaelic language out of the seventy-two languages: there are their names, Bithynian, Scythian, etc. Under poeta cecinit
The languages of the world, see for yourselves
Bithynia, Scythia, Cilicia, Hyreania,
Gothia, Graecia, Germania, Gallia with horror,
Pentapolis, Phrygia, Palmatia, Dardania.
Pamphylia, Mauretania, populous Lycaonia,
Bacctria, Creta, Corsica,
Cypros Thessalia, Cappadocia, noble Armenia,
Raetia, Sicilia, Saracen-land, Sardinia.
Belgia, Boeotia, Brittania, tuneful Rhodos,
Hispania, Roma, Rhegini, Phoenicia,
India, golden Arabia,
Mygdonia, Mazaca, Macedonia.
Parthia, Caria, Syria, Saxones,
Athenae, Achaia, Albania,
Hebraei, Arcadia, clear Galatia,
Troas, Thessalia, Cyclades.
Moesia, Media, Persida, Franci,
Cyrene, Lacedaemonia, Langobardi,
Thracia, Numidia, Hellas (?)
-- hear it! Lofty Italia, Ethipia, Egypt.
That is the tally of languages
without tarnish out of which Gaedel cut Gaedelic:
known to me is their roll of understanding,
the groups, the manifold languages.