"Be Thou My Vision" is thought to be first written by Dallan Forgaill under the title "Rop tu mo baile". While in her last year at the University of Ireland, Mary E. Byrne translated "Rop tu mo baile" from Old Irish to English. Finally, Eleanor H. Hull, a Gaelic enthusiast from England versified the hymn into what we know it as today. (contributed by Hymnary user Dan)