O'Connor had a deep love of the Irish Culture and did translations from the early Irish.
Here's one example of his work:
The Drowning of Conaing
The Shining waters rise and swell
And break across the shining strand,
And Conaing gazes at the land,
Swung high in his frail coracle.
Then she with the white hair of foam,
The blinding hair that Conaing grips,
Rises to turn triumphant lips,
On all the gods that guard his home.
8th Century (anonymous)
Tranlator: Frank O’Connor