ré(i)ghión
Definitions (by source)
region, country, 93 ; dpl. -aibh, 430. [So Measgra Dánta, 192. Cf. the spellings reidhighón, B. Col. C. 266 ; region, gs. -ioin, TC, 40, 112, etc. ; régión, SSA, 484, reighion, 518, région, 546. Later réigiún, DBr, 11, 6, Corpus Astron. ; rēagūn, Gallagher, ed. 1752, pp. 8, 23.]
Desiderius, otherwise called Sgáthán an Chrábhaidh. Editor: Thomas F. O’Rahilly.